I have both an OSP and an RDP. The OSP has a Sig RomeoZero and the RDP has a Wasp red dot. Of the two, I prefer the Wasp over the RomeoZero. Longer battery life, glass lens that cleans up easier and a metal body. Both have Shurefire XSC lights. It is not the brightest light on the market but with one spare rechargeable battery, I can rotate it for recharging while always having the gun ready for service.
The big issue that you will face is getting a holster to fit your setup. Springfield now has a holster for the XSC setup but if you prefer other setups, you will not have a lot of choices. I had to get shells custom made to fit the guns by a local holster maker who is now retired.
Good luck.