Thanks Demian, I did a lot of research yesterday and learnt that I can access my files through icloud for windows so this may well be the solution. I will test out the mac over the next 2 weeks as I can return it in that time if things get complicated. Thanks again for your response.
I prefer Macs, and I use Windows reluctantly. However, Dell has just release XPS 17". It has such slim bezels that it would be very similar size as MBP 16. With XPS 17, you can get RTX 2060 as well. I think it makes more sense for you to get a new XPS than Mac. It looks nice and clean unlike many other Windows laptop with serious graphic cards. Seriously, do gamers really like those cheesy and childish designs?
Another bad thing Windows laptops are obsessed with, including XPS, is the nonsensical 1080 or 4k. Apple and MS have the right idea to keep their screen at 3k. 1080 resolution is too low, and 4k on laptop screen has no benefit but only downsides compared to 3k.