I can't really say I believe in a specific model, but to my knowledge, and for the current version of our world, welfare states seem to be doing the least worse currently. But really, I think our world is kinda too fucked up right now to be able to have any good social-economic system (in terms of maximum equality and minimum suffering, I guess.)
Ideally, I'd prefer no state, only local communities managing themselves (something like city states, maybe?) and their relations to other communities... but I know it's just a dream, at least for the foreseeable future, considering the current realities and the ass-people in power. Because that would need many really peaceful, non-greedy and non-selfish people, which... well, never mind.
P.s. Sorry for the pessimism, and I might be wrong of course, which I really hope I am.