Aniracetam is my favorite racetam by far. It is a strong anxiolytic and helps with thought compartmentalization and speech fluidity. It acts in an acute fashion, needs a fat source taken with it, and sucks up choline, so a choline source is usually needed along side. Some people get a dulling or disassociated feeling from it, so be aware of that. For me, it is mentally calming but keeps me very sharp.
Oxi compliments Ani in the fact that it is energizing and good with recall benefits. I like it, but not enough to keep it as a staple and I get similar benefits from ALCAR for a fraction of the cost.