the ones I use :
- Twirl change, to laymen it's almost like real magic : the card never leaves their sight, is never covered and is away from the deck...and it's EASY ! What more could you ask for ? I guess shapeshifter is as visual, if not more, but it's much more difficult to have a good shapeshifter in my opinion
- Houdini change, really smooth when performed correctly
- Ego change, which I use as a follow up to the Houdini change, saying smth like "and you don't even have to tuch the deck, look..." (of course, as been said, it's better to have a purpose, a constructed routine to change the card)
As for the "Best" colour change existing out there, I really like the snap change because it's so visual, but not really practical. When the circumstances allox it (angles...), my favorite is by far the Bertram Change. It doesn't get ore visual than that imo.