It depends on what you're looking for. Boomerangs is good and I think you can stay there pretty much all day. The downside is that it's open to the general public so you're sharing the area with everyone else. You do get your own party room, but I think that's only for an hour or so.
Pump it Up is really good too but you only get 2.5 hours, but, duing that time you have each room to yourself. Depending on the kiddos ages, this can be a plus since the parents don't have to stand guard quite as much or worry about kids they don't know, etc. Either venue is fun imo so you can't go wrong realy with either.