I much prefer a straight stock on a lever gun. Aesthetically, they look much better to me. They flow to my shoulder and come on target much more naturally as well. I am curious about other lever gunner's preferences.
Straight stock by far.
If a lever action has to have a pistol grip, for me it must also have a "big loop", not the more traditional loops that have the same curvature as the stock. Those bite the [bleep] out of the backs of my fingers when I'm shooting and when I'm cycling the action.
Tom