class c or tow trailer, which is better?

One thing we found when we had our small C without a toad was that, if we needed anything (campfire wood, groceries, etc.) or wanted to go sightseeing, we had to unhook all the utilities, put away the leveling boards, go run our errands, then come back and set up camp all over again. That was pretty much of a pain. That, and in some CGs, especially national/state parks, unless you left something in your site, someone might come & take it while you're gone. (Didn't happen to us, but we did see it happen to others from time to time.) With a trailer, we didn't have that problem.

As others have said, it all depends on your camping style.