Agree with above. I'd add that weekend hand call is often covered by plastics half the time and ortho the other half. As such, ortho and plastics see the same type of cases--this is one of the few areas in plastics that such overlap exists.
Even if you know you want to do a hand fellowship, the path to getting there is much different as you know and shouldn't be decided based on which one is "easier" to get into. Neither is particularly easy to match into. Ortho is just purely musculoskeletal, and you deal with a lot of LOLs ("little old ladies") with broken hips and sports injuries. Plastics is a lot more diverse, but of course I'm very biased. As far as fellowships are concerned, I've noticed that plastics hand fellowships tend to have fellows who were trained in plastics, not ortho. I don't know if it's the same way with the ortho hand fellowships. But I digress...