Anyone else uses vastly different guns for carry?
"Vastly different" meaning make, model and caliber? Yes.
"Vastly different" from what I spent many years training to use? No.
I started out as a young cop carrying a DA revolver on & off-duty, as well as my Commander on my own time.
By the time I decided to train as a firearms instructor, traditional DA pistols (DA/SA) had been added to the mix, since we'd just transitioned to them from revolvers.
Over the course of the next couple of decades I also (understandably) added striker-fired pistols to the mix, but kept the DA (incl DAO) revolvers and SA pistols going. The software has been kept going for both the old and new hardware for a long time, so why change?
Maybe some day, if I decide to substantially thin the herd, so to speak. In the meantime, since my training/practice experience has the ingrained 'pattern recognition' needed to run the gear, it's a comfortable and reassuring thing to have going.
Admittedly, if I'd not have ordered and bought so many different guns during the course of attending so many armorer classes over the years, I'd probably have a lot fewer different guns involved.
Well, it also helps that I have the same thing going with the different types of holsters I've used for many, many years (meaning using them for both training, practice drills & quals, as well as carrying using them on my own time).