Chainsaw Gun is a nice gun, with nice ROF, low spread but low clip and damage. It's also the cheapest Event coin gun currently, and has a 8 damage melee (I checked)
Chainsaw Gun
Damage-7
Freeze-Low
Spread-Low
Clip-14
Price-24 E.C.
Perks-Melee
Summary-Probably all the stuff you already know, this gun is good for sparring, but really needs to be in perfect condition to do any real damage, a good gun if your looking to have a nice ROF for sparring
Artillary Cannon
Damage-8+Fire
Freeze-Medium
Spread-None
Clip-10 (I might be wrong Excuse me if I am)
Price-27 E.C.
Perks-Fire Damage+Explode when killed
Summary-A Awesome gun for trolling in spar, although the ROF isn't That great but certainly is a favorite by not only me, but others. Best explosive weapon currently in-Game, I wouldn't recommend this gun for sparring as a main gun, but great for Populated Basing and P.K.
Winner=Artillary Cannon
Also A.C. Is quite the package for the price.
Good Luck! 22/100 Flamethrower