Physical will be one of the better ones for massive groups that will attack. The resist all is for the nasty spells that enemies cast, but those aren't as often as Physical attacks. --- Currently writing a guide for: Diablo III Prolific Contributor: www.gamefaqs.com/features/recognition/32351.html
It absolutely doesn't matter. Just try to pick one that you think you will have an easier time finding gear with it on them. --- But lets not forget how deadly the zerg were in Starship troopers! Well until the Terrans got Marauders. - julbull73
Every kind of resistance is just as common as the next. I for one chose Arcane, because one day I just so happened to notice that I had 115 Arcane resistance without even trying to stack. It was also the day I discovered the passive skill OWE.
Doesn't hurt that Arcane Resistance is the first resistance option to show up on AH dropdown search menu. --- Rosewill Challenger | HannsG 21.5" | AMD Phenom II X4 B60 @3.7GHz | Sapphire HD 6850 1GB @875/1075 | 4gb ddr2 667 | Corsair 400w