I've always said they are the trinity, mostly because they are the ones with more solos, besides they hotter (imo), I'm not saying Louis and Niall are trash, though. They have their things.
Also Early is the UK shameless the same as the US shameless because if it is I'll still watch it for Lip & Steve but I refuse to go any further incase their are spoilers because the American version has a budget and I like things that have budgets.