Hmmm. Probably a Glock 19 RMR'ed with a SCD. Unless Safariland ever comes out with a MRDS compatible holster for a P-07 RMR'ed. Then I'd carry the P-07.
Glock because they're easy to shoot and easy to work on and I've had good luck with them over the years. Plus there's all sorts of good duty holsters for it.
P-07 because even though it's more of a pain to work on I shoot it better than a Glock and have the utmost confidence in it. But without the holsters available for the 19, it's a no go for now.