To add on to that, I like a tab with a finger spacer on the back side (if shooting split). Preferably a rubber one. You can pretty much trim any tab to size if it's too big. Having the option to add/remove layers is also nice, but aside from that designs don't vary a whole lot.
In my experience price does not equal better. I shoot a $9 calf hair tab from 3 Rivers and it shoots perfect, and I use it for 3D and hunting. Find what works best for you, buy a few extras, and use it every time you shoot whether it's 3D or hunting.