I have at least one of the pistols being discussed.
40 is a great cartridge. It makes nice big holes on the target. I use both 155 SWC and 180 FP in lead bullets and also 180 plated.
With the lead bullets, it is quite cheap to shoot.
As a pure 40, the Glock, the M&P and the FNSL are excellent shooters. I don't think I could rank those three. They all shoot very well. The FNS L was on sale last month for only $350. Great pistol at a fabulous price.
If you want to shoot 357Sig, the M&P and Glock have extra barrels available. I have the Glock barrel in 357 and find it to be the most accurate of all the pistols. For cheap shooting I load the DRG 130 lead RN bullet, sized 358. 3.9 GR of 231 is very accurate.
10.4 gr of Blue Dot under a 124 gr XTP (JHP) is about 1425 fps. Powerful and very accurate.
I run 40S&W brass through a Sig die to make brass. Works perfectly. Case headspaces off the shoulder. Adjust the die to put shoulder in the right place.
One advantage of the Glock for a 2 caliber pistol is that an adjustable sight is only about $25 on ebay. You can easily re-zero the sight, if required.