Isoceles and Weaver are good ... for two handed shooting.
Owniing both semi-autos and revolvers, there are differences that must be kept in mind.
Revolvers can be shot at odd angles of retention, without any finicky mechanics that sometimes crop up using sem-autos, depending on the caliber of choice.
The 1940’s USAR training film covers firing the 1911 one-handed.
The 1960’s FBI training film cover firing one-handed with a revolver.
IF, IF, all ‘you pistoleros’ out there, train with two-handed approaches all the time ... wha’ hoppen when yo’ don’ got but one hand tah use????? Wha’ hoppen if dah udder hand is dah one, huh? Kin yo’ do it?
At an average of 18 feet, it don’t matter if your on your back with a fractured skull. You’ll get him.
Since I shoot double duelist in SASS, my pistol time is 50/50. For serious social occasions I prefer a modified Weaver.