Which chomper for pvp?

I like my hot rod, his speed has saved me (or killed others) a lot of times. 

As mentioned, Hot Rod's speed boost can get you in and out of trouble very nicely if you're careful with your chomps.

Electric Chomper is an old favorite of mine, because he does a pretty good job of doing good damage to groups - goop the capture point, and pop out of burrow to do some lightning breath. You might not be a kill machine, but it will at least help other plants take the objective.

Count Chompula's health on swallow could be equally useful as Hot Rod's speed, helping you survive and re-engage after a chomp.

If you want to do some range support, Yeti Chomper is the clear winner. Good ability to do damage as you approach, and then chomp.

Yéti chomper and hotrod are good in general, count chompula is decent at G&G and work at any another gamemode.And if you just want a substitute to fire chomper, power chomper also work.

I prefer Hot Rod. You'll likely have already been shot several times by the time Chomper finishes chewing, so the speed boost will help you escape and live another day.

Fire chomper is the best. Deals really good damage along with the Dot to help even more which kills pretty quickly. Second would be the electric chomper.