It depends on which spec you are running. As Destro, a crit set is totally viable and with a good team may even be preferable to other gear sets. If you are running Demo or Aff I would suggest sticking with Stam/Int.
Ultimately, find the amount of SP, health, and crit you find to work for you the best. I have like 8 (?) different sets of gears I use for different occasions, so that of course is also something you can consider! However, when just pugging/messing around I've found an even stam/int set (which in full bis gear you still maintain ~12% crit) works perfectly for me.
Have fun man, glad you're enjoying warlock!