I like all of them. Jet has a clashing system not found in any other WH game, it's pretty cool. As cool as the Death Matches are, is not a deal breaker for me, I can do without. The coolest port of WH2 is for the SNES, higher speed and seesaw bar in normal matches if you want it to, pretty cool feature, makes a vs match last forever if you want it to.
WHP
WHJ
WH2
WH
I've always been a big fan of them era games, that look is awesome. At the top of SF2 times I like Karnov's a whole lot, I like the gritty look.
People call WH an SF2 clone and they're right but that's not a bad thing. I think the clone games are what make the genre evolve into what we have today. If it wasn't for Capcom, the SF2 bootlegs and SNK we wouldn't be having this conversation.