The Energon Pub

decepticons get guns, blasters, bombs, flamethrowers, ice machines? gun...

autobots get axes, wrecking balls, nunchuks, throwing stars, sheilds, laces... and zap zappers & magnets?

despite the bad ass-iness THOR HAMMER.

why?

design?
choice?
energon limitations?

what do you think?

I'm assuming you're referring specifically to Transformers Animated (or Beast Machines but less so).

It was an intended choice to better convey the Autobot's role as peaceful robots and make the Decepticons look better suited for war and have them appear a more formidable antagonist.