The difference is Boston just took Miami to 7 games in the ECF and gave them the toughest series this year.
Nash just missed the playoffs in Phoenix again where his second best player was...Jared Dudley? Marcin Gortat?
See the difference?
There IS no difference. Both players saw a better opportunity than the one they were currently in. Both players chose based upon what's best for THEM. The only difference is that one is a CAC media darling and the other is black...