I have both, a 62" Greatree Mohegan recurve at 25# for my daughter (which I sometimes use to work on form) and a 62" Samick Sage at 45#.
I know alot of folks have given the Samick Sage good reviews, but the riser on the one that I got when ordered from 3Rivers had some weird scratches in the wood. Other than that, I like it alot. The Greatree Mohegan shoots really well, too, and was cheaper than the Sage. In fact, the local bow shop sold me the Greatree, all set up with string nock and arrow rest, and half a dozen pinkish arrows for her for less than the Sage when you include shipping costs.
I have no other experience with any other kind of Samick or Greatree, but I think both make good beginner bows.