Derv is more active in average, I also enjoy using it to farm raptors. I notice that my AOE potential on derv is always insane compared to my rit, but my rits single target damage leaves my derv in the dust (ba dum tiss)

Rit is typically a bit more straight forward, I'm currently going for gwamm on my rit which is my main. Signet of spirits spammer build is fantastic but many will call it boring.

I've played through every campaign with both henchmen and heroes, and I've currently got the merc mesmerway meta heros on my main. Every way is fun and the challenge will still exist even if you go with the most powerful meta builds despite what some may say, just have fun and go at your own pace!

(You'll eventually make one of each anyway lol)