The Galaxy is a higher function radio. It has lots more features than the 29 does. Side band for instance will gain you 80 more channels and about 4x the range. If your looking for a trail radio to talk with your buddies then just do the 29 but if your looking for more serious communication then the Galaxy is a much better radio.
edit: be prepared to have either of these radios professionally adjusted to get them working to the best of there abilities. Especially the Galaxy's side band.