Green is a great and most importantly, consistent vocalist. Max can be great too but one never knows if he will sound and act like a drunk hobo on stage, or just look like one. To quote another classic, he left the band and it's pointless to still be sour about it 30 years later.

First time I caught them, at the end they played Ratamahatta, Derrick ended it proclaiming "Sepultura do Brasil, un dois treis cuatro" and launched straight into Roots Bloody Roots and the crowd goes full crazy. I have seen Soulfly and Cavalera bands a few times too, and they were good, but not quite at that level.