Best program for GPU hash cracking?

Yo.

So as I'm sure you've seen in my previous posts, i'm currently using OCLHashCat to crack hashes, primarily MD5, do you have any config recommendations for OCL?

Or do you suggest using other programs? Currently I'm downloading 1TB worth of MD5 Rainbow tables, I plan to test it out using a rainbow cracker.

I'd prefer suggestions be GPU based, as that's what my rig revolves around.