I get excited about different laptops occasionally...and then I remember that I won't have a trackpoint if I switch to a different brand, and I get disappointed. Literally happens every few months.
Using your thumb to control the trackpad works better on Mac laptops because the Force Touch trackpad allows you to press anywhere to click. Most PC laptops have a "diving board" click mechanism which means it gets progressively harder to click the further you are from the bottom, and clicking near the top is impossible. Also, Mac laptops position the top of the trackpad closer to the keyboard than other laptops I've seen.
You can use tap-to-click as a work-around for being unable to click the top of the trackpad, but I find tap-to-click less usable for other reasons.