I doubt that the quality of mobile games will ever be able to compete with PC or even Console games. The biggest part of that is the lack of fairly comfortable controls without obscuring the screen. As such you will end up just trying to shoot someone with a gun control that tends to slide off the screen, or not jump due to some odd grit.
I do play both from desktop and mobile. But to be honest you should find a website where you will be feeling comfortable. For me it is here https://canada-online-casino.com/spin-palace-casino.htm What I mean is that for me its gaming interface feels pretty much at home and I play there whenever I can, once it was even in the aircraft which added some unforgettable experience for me.