I also use a belt type inflatable with my waders or plain shorts. It allows a lot of mobility. I do keep a full type three in the front hatch just in the case that you have an extended stay in the water. I also suggest practicing in a pool. I know I can get back on fairly quick and I am a pretty confident swimmer. If you practice in a pool, the regular pfd may be the type of bouyancy you need to get up onto your yak again. I say try them all out. Living another day to fish is priceless.
