Always hard when you've got an all-rounder against a specialist bowler or batsman (or keeper for that matter) in these comps, and it's one of the flaws of having them competing against each other. If it's in any way close, you'll always get "plus, he could bowl a bit" or "plus he was a pretty fair batsman too", and the all-rounder's home. Dunno how this can be resolved, really.
But I'm gonna give a lone vote to Bob Willis, because I think he deserves one. He was a great British quick with an excellent record, who never lacked heart and commitment, even if he looked so unlikely. Hell, I'll even defend him as a commentator, even though he seems much-maligned on that basis.
I've always thought Pollock was something of a pillock, and whenever I've been watching, he always seems to get injured or avoid the ball when the chips are down. His overall cricketing talent was definitely greater than Willis, but if I had the choice between the two of them for my side, I'd go for Willis.