I like all different sub-genres of punk
Early (Ramones, Stooges, New York Dolls, The Clash, Johnny Thunders, Sex Pistols, Stiff Little Fingers, Vibrators, Teenage Jesus & The Jerks, The Slits, X-Ray Spex, Undertones, Joan Jett)
Hardcore Punk & Oi! (Black Flag, Minor Threat, Bad Religion, Bad Brains, Dead Kennedys, Sham 69, Cock Sparrer, Discharge, Cockney Rejects, Peter & The Test-Tube Babies)
2-Tone & Ska Punk (Specials, Selecter, Bad Manners, The Beat, Madness, Operation Ivy, The Aggrolites, Bosstones)
Celtic/Folk Punk (The Pogues, Dropkick Murphys, Flogging Molly, The Roughneck Riot, The Mahones, Real McKenzies)
Riot Grrrl (Bikini Kill, Huggy Bear, Bratmobile)
90s pop-punk bands like Rancid, Green Day & The Offspring
I respect punk bands who explore other genres and sounds.The Clash started out punk but they've experimented in just about every musical genre and so have Chumbawamba*! The Pogues main influences are punk, Irish folk music and country but they've also done a lot of experimentation with other sounds (including hip-hop & rave)
*look em up on wikipedia, there's so much more to them than Tub Thumping!