Field lacrosse is much better than arena lacrossa. I watched a few random college games and it was actually really interesting, while I can't really say the same for the arena variety (it's not just the playing surface that differs, but the size and shape of the field as well). With that said, I still prefer hockey, although I think a professional field lacross league could be interesting to watch.
I love ice hockey. I've watched a few lacrosse games, both arena and field games. I just can't get into watching it. I'm sure it's a blast to play, but I'm not very excited when I'm watching it for some reason.