Limit is good because you can't lose your stack in one hand.Also the swings aren't as bad per hand BUT the swings over a stretch can be nasty.

NL the bad players will also die out quicker.And requires a bit more skill in certain areas.Limit allows for some autopilot mode but eventually that can be bad too.

It trully is personal preference though.Same as why you would choose Stud or Omaha.