Rhino vs Galahad?

Galahad. No brainer.

Rhinos are difficult to pilot and sooooooooo slow.

Got a golem, two Leo's and griffin. All level 6 but I want a bot that will last not one for just now.

Have you opened your 5th slot?  2 bots >>> 1 Galahad.  There will always be the opportunity to buy and upgrade Galahad later... you can keep upgrading weapons and your other bots in the meantime.  

Also, weapons you use and upgrade on the Rhino or Griffin you put in that 5th slot will immediately outfit your Galahad once you do get it (with the bonus of one extra medium weapon left over).  

I've read, Rhino has a very high learning courve. Well, we'll see. I just level mine...

For most purposes, Galahad. But Rhino is tougher and has more firepower - it's less versatile but tankier. And I think sometimes that can come in handy.

I generally use 2 Galahads, a Rhino, a Griffin and some variable fifth bot (Fury, Carnage or Lance, depending).

 TBH, I would get both as they cost different currency.

Yes, Rhino is much harder to learn.  Learning the Rhino is worth it, however. Even the YouTuber, Adriannnn had said that it took him somewhere around 2 weeks to get it down in his Rhino tutorial.

My advice, if you get the Rhino, learn it with either a RDB setup or a DB setup. Reasons for this:

RDB has 500m range, so you can stay back a little as you learn to drive it, and still have a decent contribution to the battle. As soon as I felt that the shield mechanics are becoming familiar, I would outfit the big bad beast with a DB setup. Once you get the hang of close range fighting with DB, I would then try a PDB setup, for several matches, until I decided which one I liked the best. Then you can experiment with different light weapons, leaving the favored mediums as is.

Galahad is easy to learn. Basics are:

Shield to the side when moving or when fighting but not taking a lot of Plasma or Bullets and when fighting a DB bot so you can run away and out pace the short range rockets. Shield in front when advancing on a PDB or Projectile Weapon setup, still attempting to use cover as much as possible to keep from losing your shield too quickly.

General tactics for each:

Rhino: It has become better to flank and ambush with the DB variant, rather than charge in rockets blazing. When running PDB, same as the DB but try and maximize your 350m range and stay out of range of DBs if at all possible. Corner shoot when you can. Use Ancile bots by running with them when you can.

Galahad: Beacon capture and defense should be a #1 goal. Learn how to take on bigger and badder bots while evading return fire and blocking what you can't evade. Use cover. Flanking and ambushing is also advised, unless running with an Ancile bot, then use them for the purpose they are meant for.

There is not too much difference on paper between the two bots as far as what to do to use them efficiently, however, Galahads can have full protection of their shield while employing all their weapons and still maintaining a large amount of mobility. The Rhino must give up turning while shielded. And moving backwards. And its medium weapons. Those three things make the Rhino unsuitable for a direct charge standoff bot. 1v1 with most bots, you should be able to charge them, get close, and drop shield and destroy them. Otherwise, if facing multiples, come at them so that you are only in danger from one bot at a time if at all possible, and always have a plan of retreat in case you get flanked or ganged up on.

More detail needed?  There are tons of YouTube videos of competent players that use them.  Watch them and pay attention to when they use the shield, when they don't, when they attack, how they attack, and how they get out of danger.

JMO, YMMV.

You'll want both in all likely hood... And you'll have space, because you really want to dump your Golem and Leos.

I've got ~24 maxed bots including 3 Galahad and 4 Rhino. They are similar but have different strengths. I'll often use 2 Galahad (plasma) and 1 Rhino (DB) in my active hanger.

The Galahad is the Mohammad Ali of War Robots- dances like a butterfly, stings like a bee. The Rhino, on the other hand, is Mike Tyson- takes a licking, gets straight in there and hits like a ton of bricks. 

You need to play a Galahad smart- 2 volley for a TT Fury will wipe it from the map, so you need to avoid slugging matches and getting double teamed. Take the longer road when going to center or taking the left beacon on Canyons, and be prepared to bend and fall back when defending a beacon. Run correctly, however, you'll find the Galahad can bend very far before breaking, and it can be one of the most durable and longer lasting front line bots in the game.

The Rhino doesn't bend nearly as well- you can turn and run, but it can't do a fighting retreat like the Galahad. It will, however, take a licking and punch with the best of them before going down. It's harder to play- it's easy to get over-extended and and trapped, so work on keeping your head up (situational awareness) and picking your spots. Thus typically I'll drop the Rhino when I need to take a defended beacon, while I'll drop a Galahad when I'm marauding from the flank.

One thing to keep in mind: the Griffin fills the role I've outline for the Rhino above very well, often better. So your real choice is between the Rhino and Griffin. The Galahad is currently easily best at what it does, and doesn't have a close competitor. For that reason if you can only have one I'd choose the Galahad- best plasma bot in the game currently (imho). 

I think advice on the forum already given is sage.

You'll ultimately need both, but for me, in the level 7-8-9 bot/weapon range, I just bought another Galahad because I find it VERY fast and aggressive to use in the first 2 minutes of play. I usually grab 2 beacons with shield to my left, then flank and march forward (and it holds it well against level 9 weapons despite my level 7 HP). So I bought another, in order to have a 1-2 bunch deployment, followed either by either a Griffin/Carnage, and ending with either a Boa/Leo.

The Rhino is too slow and complicated to learn for me at the level I'm at, so when i'm ready, I'll transfer my Mag Tarans over from a Griffin, or some derivative thereof.

I'd stock up on weapons honestly rather than blow WSP.

Just a quick side question, if I may:  Why the Rhino over a Lancelot for a tank? Damage?

Same here. My Rhino is mothballed because it is just free damage for enemy Furies