Luckystar5: Fyi, my tablet is an 18.4 inch screen, and my laptop is a 17 inch. Don't rule out mobile play thinking only a phone, or 7 and 10 inch screens. I find that the touchscreen is a lot easier and more reactive than my mouse, I know that there are great mouse's for game purposes, just my opinion that tablet is easier.
Similarly, I play on an iPad Pro, which has a 12.9-inch screen. I find it much easier to play on it than on my MacBook Pro. And besides adding a mouse to a MacBook is like putting training wheels on a racing bicycle. It would just get in the way without providing additional utility.