1st what kind fo multis are these? are they 2 tables? 3 tables? Low numbers (100 or couple hundred? Large?

If you are playing SNG's the difference wont be to terribly great you will still encounted the same sort of play. If you are playing in bigger multi's the play wont move too much but you will get a stronger showing of better players, it wont be a huge jump, but it will be there.

As for other sites, to each their own IMO, you should play on a couple different ones just to get a feel, but then pick your fav. Personally I love stars, some people hate it, so you are just going to end up with a variety of opinions to this question. Welcome to the forum and good luck!