I personally think that Minecraft is a lot better in PC which has wider screen. I'm not that much of a fan of Minecraft, but I played it for 3 months if I remember it correctly. If you're fond of building cool houses, portraits, minecraft art, and whatnot, I think it will be a lot easier in PC. Personally, I find the mouse and keyboard (shortcuts) a lot manipulable and efficient than touching the screen of a phone. In keyboard, if you're used to it, you can use all your fingers while just relaxing you upper back. In a mobile phone or tablet, I find using more fingers quite uncomfortable, lol obviously, sorry. But, yeah, it also depends on where's your comfort zone, where you're more used. But anyway, just give a try for both of them before you decide what to use for a long term.