The .40 135 gr slug does not make 1400 fps in any gun I know.
The 125 gr Sig load goes comfortably past that in a few loadings.
Really both the .40 S&W and .357 Sig are excellent in their own right. One has a bit more weight and bore diameter, the other more speed.
I've got Glock subcompacts in both rounds (and 9mm) and I like all of 'em.
I only wish they made a carbide sizing die for the .357 Sig that was priced a bit below $100 bucks!
"The government has confiscated all of our rights and is selling them back to us in the form of permits."