IMO Allegri couldn't have done what Conte did, in taking a 7th placed team to unbeaten champions.
I also think Conte couldn't have done what Allegri has done, in having us two games from a treble.
It's not that one is "better", they're just different.
Conte's manic energy and sheer force of will was what we needed to get back to the top. I don't think Allegri could have pushed that team to the Scudetto, and without losing too. Remember, we still had frickin' Borriello, while Milan had Zlatan!
Once we were back at the top, we needed Allegri's calmer, more considered approach to make that final step. Conte couldn't take losing any game, and doggedly stuck to his ideas. It's in some ways his biggest strength and his biggest weakness.
I think we needed a Coach who was willing to lose the odd game in Serie A, change system and play with less intensity sometimes to compete on three fronts at once.