If you consider how plants grow in nature, they generally attach themselves and grow in one position for their whole lives. Just my opinion but I think it's better for the plants to be stationary if you can manage it. If they grow towards the light, and you can't see the nice new growth that way, turn them 1/4 turn every month or two, maybe?
The direction your window faces will affect the angle of the light, too. Even if the light doesn't hit the plant directly, (that's good) for example if the window faces either south or north, then the light will move from one side of the window to the other (east to west) as the day progresses. An east or west facing window will have less range of angle.
