I've shot both. 6 of one/ 1/2 dozen the other. Shooting wise, I really never noticed improvement/deficiency either way. My current one's have flat MSHs. I prefer the look of the flat, FWIW.
MSgt, USAF, Retired
NRA Life Member
The hardest thing to explain is the glaringly evident which everybody had decided not to see. - Ayn Rand