If you widen your stance, are you working your inner thighs more? Vice versa?
I noticed yesterday doing narrow front squats that my outer quads got more work. I used to think widening my stance was safer/more stable, but I think that's what led to my quad tendinitis...too much stress on my inner thighs and not enough work on the outer.
If I want to work on my hip abductors/outer thighs, bring the legs in? What do the various squat variants target in terms of quad muscles?