A good fit is the first thing I look for. I've tried umpteen different gloves, and can shoot with pretty much any of them if they fit properly. You want it so tight you can barely get your fingers in when it's brand new--when it's broken in, it will be about right.
If your ring finger gets numb/calloused, you are probably torquing the string and/or pulling too much with that finger. The middle finger should carry most of the load.
As for what brand, you will have to decide what you like. For the last few years I've been using a Super Glove, but I only buy them when I can try them on first. With a proper fit and a deep hook, haven't had any trouble with my release. If you shoot 55# or less, the Skookum might work better for you. I used Damascus gloves for several years, but was wearing them out too fast.
Like most anything else in this sport, you can find people that love and people that hate the same product--boils down to personal preferances.
Chad