Just bought a base spec 15” after deliberating whether to get the 15" or a RAM upgraded 13". I checked them both out in the Apple store and to be fair, the 15" isn’t all that much bigger than my current 2013 era 13” MBP so I thought why not. I was close to getting a Windows laptop again and in fact, I did buy one a little while ago but returned it due to terrible battery life (which I'm aware isn't Windows' fault).
The main things that swayed me were the trackpad and it may seem like a minor thing, but my Windows laptops all lose a fair bit of battery in sleep mode overnight. My work Dell XPS 15 can drop 8-10% if left on in sleep overnight whereas I can leave my MBP in sleep overnight and it'll still be on 100% the next day. The other laptop I had for a while, an HP Omen, also did this, though the battery life on that just plummeted for no reason at all. Not sure if all my Windows laptops have some kind of issues or if that's normal or what, but I have and have had other laptops that do the same sort of thing.
I've still got my Windows laptop needs catered for with my work XPS 15 so figured it was worth a punt. Still feel a bit abused after forking out that much cash for it though but arguably if it lasts me 4-5 years like my current MBP then it's not bad going. To be fair there's nothing really wrong with my current 13" MBP, I just fancied a change and a bit more grunt.