Here is a tip: if you think practicing straight pool is better than practicing 10 ball, which is the game that you can win tournaments/money at then I recommend starting all runs with a power break like you are playing 8 ball. Not starting with a 14.1 break shot.
Shane has proven how important a good controlled power break is to making six figures.
I think this is very good advise. Especially considering most guys start out their straight pool practice with that phony side pocket break. They'd do more for their game with that suggestion.
My biggest problem isn't choosing which game to practice, but rather being able to practice at all for more than a few minutes without getting bored, and I have a GC in my basement.
Rotation games don't hold my interest at all. At least 14.1 requires some deeper thought for the mental side of the game.