As long as I can remember I have used the Weaver stance. I used it even before I knew there was one. It just seemed the natural way to hold the gun to me.
Isosceles seems a bit awkward but maybe because I have become so used to the Weaver.
I have always used the Weaver, way back in the .45 days in the Army, but got used to doing Isosceles when they started doing a lot of shooting from the left corner of a building to the right corner of a building for training.