Rubiks pocket - crap. But I bought one for a kid because there are tiles on it and it's tiny. Good for a durable non-speed solver
V-cube pillowed - hard to hold, but very springy. The pieces can flex out quite far. It's good for people who like it to look cool. But not for competitions.
Shengshou and the new SS Aurora - FUN to use. They are silky smooth is a nice cube to solve slowly. The new Aurora helped the catching of the old one but not by a lot.
Dayan - best for speed cubing. I use this when timing myself.