Usually I try minimized, unless it looks too low. (Anything less than 105mm is generally suspicious, but some cars are fine lower, and some need to be a little higher).
If I have bouncing problems which appear to result from the modelling of bottoming-out, I will try raising the height a little.
Usually I end up having the front a little lower than the rear--sometimes a lot.
It's not clear it's real-world physics, but in [size=+1]GT1[/size] it does seem that low front ride-height allows more steering control through a corner without contributing fatal final oversteer. (Except perhaps on RX-7s which seem to have a tendency to sudden mid-corner or final oversteer).
So I guess I'd generalize to low front/high rear.