I was going to vote for the Bernstein M9 but once I heard the Giulini, I could tell why it was in the lead. ;-) I love Bernstein's Mahler, but goodness, the Giulini is a great account. Especially for all the stunning details that he reveals...wow.
Everyone probably already knows that i have a soft spot for the M9 Finale, and if you don't, you do now. LOL. So, that said...I love the way Giulini's horn plays the great restatement of the main theme at 6:45 in...wow. It is not emotionally excessive, per say...just nice and powerful.