I wouldn't really consider the gibson a thin body, however i do think the sound produced is more along those lines. For some reason it doesn't have the fullness of a taylor. I think you should probably give some of the taylor's another chance. If you're planning on recording at all, I would seriously disregard the gibson. I think the martin also lends itself to a warm sound because of the sometimes overwhelming chracteristics of the low end. Taylor's have a much more balanced sound, so naturally playing them one next to the other will lead you to believe the martin is warmer, due to lack of high end. Again, if you want warmth on a recording, that's what eq is for, but you can't produce what's not there to begin with so i would go for the taylor. I don't think you'll ever feel like you missed out with it.
Brandon