I don't know about the best but I like how Andre direll was switching when he fought Abraham. Clean and smooth.
I'm a Dirrell fan but I like Ward better as a switch hitter. I'm a Dawson fan and if I'm not mistaken, didn't he switch hit a few times? I hope to get his career set and find out.
Naseem switch hit all the time, hit with awesome power in either stance...but was off balance a lot of the time aswell. Still a very good switch hitter though.
Junior Witter was very good at switching. He should have been called junior "the switch hitter" witter...
Chipper Jones was almost equal from either side in his prime. Mark Teixeira is good, but no power as a righty. Harold Baines was decent. Personal favorite was The Mick.......Tettleton that is
cotto is an orthodox fighter and has a strong left but has less effective right. i think he's a converted orthodox.