Just switched from a macbook pro (been a mac person all my life) to a Surface Pro (WHERE IS THE DOCK?!?) All kidding aside, I'm really loving the surface pro. I do a bit of PC gaming, and surprisingly this tiny thing can run Dota 2, Cities Skylines, and Guild Wars. I won't be using it permanently for gaming, as I may be acquiring a true laptop (ASUS) soon, but if you are into that it'll work. On a more serious side of things, I used it to highlight and manually annotate research papers for my senior thesis (Drawboard PDF is the best!) which was a million times better than doing it on a non-touch screen laptop. I have also used it to annotate powerpoints, which like you said is a huge plus. One of my classes this past semester used an online program called Draw It to Know It (which is great, if you can pay the subscription fee :/), and drawing the tutorials was a breeze with the tablet. I have also used Drawboard PDF to create blank documents and draw pathways (super useful for classes from neuro to biochem to inorganic chem), which is an amazing hands-on way to learn them without taking up pages upon pages of notebook space. If you're creative, I have recently (today) found out that Drawboard PDF also works really well for, well, drawing artistically. I started working on drawing a character for my D&D campaign today, and so far it's coming out great!
I can speak to Macs too, having owned one for most of my life. They certainly are survivable--in HS I used my mom's old macbook pro. It was already 5 years+ old when I got it and made it to 10 before totally kicking the bucket. The one I got for college was going strong after 4 years, but had an unfortunate run-in with my glass of water. So if you're not a klutz, you could drop the extra $$ for a macbook and be set for years. Being a mac person (not sure where my allegiances lie now) I can also wax poetic about the UI. Everything is super accessible, and looks super nice. One thing I have discovered since getting a windows machine, however, is that the Office Suite looks like absolute **** on a mac. And while you can't annotate slides like with surface pro, you can write notes in the bottom of the ppt slide. If you have any more questions about either computer, feel free to pm me!