The .357 Sig has less recoil than the 40 S&W and 45 acp, this is easily determined by shooting; however some people subjectively confuse blast with recoil, so then use an objective calculation.
The power factor PF calculation is bullet weight x bullet speed / 1,000
Run that calculation and the result will show the .357 Sig to have less recoil than a comparable 40 S&W or 45 load (Ranger T vs Ranger T) out of a comparable size pistol (Glock 32 vs 23 vs 36).
Why it's not popular? Price & availability. Some people want to walk into a mart to buy ammo, others have discovered that ammo can be purchased online (assuming you don't live in one of those restrictive places