I'm just not a fan of the 357 Sig. Just not.
For decades people wanted SOMETHING between 9mm and 45 ACP - give them the 10mm Auto and 40 S&W, but they're not happy. So what's the next GREAT thing? Neck down the 40 S&W so we can have the reduced magazine capacity of the 40 S&W with the smaller bullet of the 9mm - OUTSTANDING! Really? Aren't we kind of re-inventing the wheel? 38 Super Comp seems like a better solution - just because of magazine capacity.
It just seems a bit odd.
Now that said... the 357 Sig is a fine round. Nothing WRONG with it. The thing that makes me "not a fan" is there is a lot of hype about it - "flat shooting", "unbelievable manstopper", etc.
With proper bullet selection there isn't a nickel's worth of difference between 9mm, 357 SIG, 40 S&W, and 45 ACP. Shot placement with any of them will get the job done. Each caliber has advantages and DISADVANTAGES. Choose any caliber you want, but understand your decision has compromises.
"Arm yourself, arm a friend!"