Agreed on the Quantar, especially for the price, power and getting analog and P25 out of it is fantastic. The Yaesu repeater is definitely amateur, with the low power output, easy touch screen programming and what's going on inside hardware wise. Still, with zero Quantar experience, I was able to get one configured and going, although there was a learning curve. Having previously programmed an XTS, APX and XTL helped me to some degree.
Used P25 handhelds are relatively inexpensive. It is the software and lack of experience programming them that keeps it mysterious for many. I have encountered many other amateurs who couldn't understand how to program DMR. They would **** themselves with Moto CPS. Still, I welcome all flavors of digital modes, if I had to choose one it would be P25 and that is due to the quality of the Quantar and older Motorola handhelds/mobiles used to enjoy P25.
As to popular digital modes, we have more DMR repeaters in this area than Yaesu Fusion, D-Star and P25 combined. With that in mind there is significantly more P25 and Fusion traffic than DMR. In central California P25 is used most with Fusion second and DMR last. We currently do not have a D-star repeater nearby, but that is changing soon.