It comes down to personal preference. I’ve always built my own PC’s since I was a teenager.
That said my Laptop is a Macbook Air, so I use Windows and OSX daily. Hardware wise I think the trackpad with gestures on my Macbook Air is amazing, its certainly the nicest laptop i’ve ever owned.
However for day to day use I prefer Windows, I just find the way Windows does things works better for me. Plus working in IT and having a general interest in computers theirs a lot of obscure tools I randomly use that are Windows only.
I’m not really locked in to one ecosystem which allows me to use Windows & OSX without much hassle. My phone is an Android device running LinageOS, I use Dropbox for cloud storage, Chrome is my browser of choice and WhatsApp / Facebook is how I message people. I don’t use anything that’s locked in to a particular ecosystem such as iMessage, iCloud or Facetime.
As you have an iPhone you might well enjoy a Mac more for the better iPhone integration.
If it was me I would go for a PC, you can upgrade the graphics card, processor, ram and hard drive very easily in the future. With a Mac your pretty much stuck with what you get and will likely pay a lot more for it. These days a lot of nice Ultrabook style Windows laptops exist, if I was looking for another laptop today, i’d choose something like that over an Apple laptop.
Your obviously comfortable with both though, so i’d go with whichever you enjoy using the most.