Don't just choose one, tell me why.

Sorry i forgot to post that.
It will be the primary slot on a Falcon. I currently have 2 lvl9 Advengers on the Fangs out.

I too think nucleon would be better fit on central slot, because of constant fire. Glacier can't compete on that field, it fires its load and what then?
Glacier would be perfect for fangs out if you have two of those.
I run avenger in centre slot and 2 glaciers on side slots and it's a super fun build, can even be effective. But everything I have is so low lvl, 5-9, and I constantly get flushed down the toilet... Seriously, I don't remember when was the last time I destroyed a bot.



I'm at 8000 shartz for nucleon, gonna replace that avenger when and if I complete it. 

Apart from what everyone else has said, the Glacier has a range of only 300m. Nucleons can fire, with full accuracy (up to a point) from 500m away.

That's completely irrelevant though. The point is that you want something that can deliver damage in that one weapon slot. And Nucleon has more than twice the DPS than a Glacier. Plus, many players expect a Glacier nerf.

On Falcon...Nucleon on center, Glaciers on wings. ;-) 

The influx of Ravanas means you need to have a weapon that can constantly fire and the nucleon does that.

I've decided to retire my maxed out Bulwark with glaciers as it just can't keep the sustained damage up anymore. If I had 2 nucleons, I would run it with those.

I have used both on a t falcon so slight different, both were mk2 lev 3. I wound say nucleon is much better choice, I found the extra distance and substained fire of the nucleon was better.
How about 3 nucleon on the falcon, now that would be cool ?