?!
Let me guess, you've not been drumming long or you're self taught. That's assuming you're a drummer.
Portnoy is incredibly overrated... You're not likely to believe me but believe me. There's nothing Portnoy's ever played that you can't pick up after listening to it a couple of times, I've been playing a little over nine years now, and three years ago I thought Portnoy was the shit. However, the for a while now I've been taking classical lessons - the usual rudiments and proper techniques. I very quickly realised that portnoy (and peart while we're at it, though to a lesser degree) are complete stunt drummers. Lopez has an awesome fusion style of utter death but incorporating many techniques (and using them incredibly well). His fills for instance always use great sticking patterns it takes a good while to get your head round - they're clearly well orchestrated. He has clear influences from so many different genres (Bonham being perhaps the most prominent in some aspects) and his playing features heart and soul. Portnoy just single sticks (left right left right etc) around his kit fairly fast. Thing is, if he could actually play any rudiments (even double sticking for christs sake) he could get round that kit twice as fast. Lopez outshines him in every respect - It's like comparing a mcdonalds to a lobster dinner.
As for Anders or Martin,
Anders style is more direct, less loose and tricker in places, but usually physically easier to play. Martin Overall would get my vote but Anders is more than qualified.