I have both boards and in my opinion the 07 requires more power to get on plane. It can feel sticky unless there is steady wind to get it up and going. The 05 for me was one of the best to get going in lighter wind and gybed well on flat water, something that I find the 07 doesn't do particularly well unless you really maintain power throughout the gybe.
If you have the wind, the 07 is definitely superior on the wave. I find it quite loose and easy to get vertical. Compared to the 05 it has a more direct feel on both frontside and backside turns. For what your currently using your 05, it is the better board.