Lanlan 2x2x2 is one I use, it's good, but there's also Ghost Hand and Witeden Type C to consider
Guhong is good, but there's also Zhanchi by Dayan as well
The Floppy cube doesn't really matter because I think that only 1 company makes them (then there are the knockoffs)
Lanlan 4x4x4 I'm not sure, but try Shengshou V3, I hope I got the name right
Pyraminx, Megaminx, I need to know the brand first. For pyraminx I suggest QJ and for megaminx MF8 V2 or Meffert's
5x5x5 best corner cutting would probably be V-cube 5, best for other ones are the ones I listed (imo tho).
lol, here to help ^_~