Career mode in RM is pretty bare bones. Character customization is basically just choosing from several options of faces, body types, etc. There is no GameFace, like in TW games of old.
There is equipment and apparel to unlock, but not a huge amount of it. I'm 3 years into my career, my character is maxed out at a 92 overall, and I've unlocked all items I can.
That said, the gameplay and presentation is good, so I keep playing it and enjoying it. They've added all the post-release courses into career mode, so there are now about 25 events in a season.
The game is worth it for $16, even with a career mode that could use a few updates.
To me, it's hard to compare RM to TGC. TGC doesn't have a career mode in the same way RM does. You have to join the TGC tours (more info can be found on that elsewhere in these forums) to play in that kind of scenario. I like the swing technique in RM more than I do in TGC, but I think there may be an update to that coming soon. Graphics are better in RM as well. The major appeal of TGC, obviously, is the sheer number of courses to play. I get enjoyment out of both games, but I play RM more than TGC.