I have all 3 on Switch. I liked XC2 much more than DQ11; XC2 was actually fun to continue in NG+ (and Torna DLC) while DQ11 really drags in Act 2, and then gets even worse once you get to NG+/Postgame. FF XII is pretty divisive. Personally I think it's the best game in the series by a large margin, but others are turned off by the story being not so grand as other FFs or JRPGs in general, as well as the way Vaan is presented as the protagonist even though he (and Penelo) are really just tagalongs mostly irrelevant to the actual main characters.
Overall, I'd say XC2 is the safest bet. I didn't even like XC1 much (but loved XCX) and I would still strongly recommend it.
As far as ports go, DQ11 on Switch is by far the best version of the game and FF XII is top notch too.
Edit: I should probably mention that DQ11 was the first game in the series I've ever played. I really liked it at first, but stalled out early in Act 2 when I rented it for PS4, then bought it for Switch like 9 months later and finally beat the main ending. Still haven't been able to force myself to continue to the true end though.