M&P 2.0 vs p320

Currently I have a ria 1911 5 inch chambered in 45. Currently looking into a 9mm pistol that would only be used in the range. I currently have no plans to carry either of these. I’ve read that the M&p is the better choice out of the box. The only reason I’m looking at the p320 is the optic ready slide and customization options. I know I can get an optic ready slide for the M&P but after purchasing, it would be similar price to the p320. Does anyone have experience with both of these? Is the ability to customize with the sig and optic ready slide that big of a factor?