I have no idea! A few months ago I'd've shouted 'One to Three, Seven is Vile, I hate her! They never should have brought her in' but having actually now watched Season 4 onwards properly she's really grown on me, and some of the storylines are good Season 5 in particular is great.
There are other things that I like more about season 4 onwards too that I'd never seen in any depth - Paris/Torres growing together from brand new lovers to parents, the various jumps towards home rather than still being rather hopelessly 75 years away, letters from home, Janeway's much better hair..... I still miss Kes though.
After much consideration I'm going to vote without looking at other people's choices first, and I'm going to go for preferring 1-3. The thing that tips the balance for me is it was a shame as others have said that once Seven arrived she got so many of the episodes focussing on her. Yes she was great, but I think it was a waste of the potential of some of the others.