Yeah, I really like the idea of something with a large userbase. I'd definitely be relying on support from forums if anything went wrong, as I don't really know anyone who uses Linux. Thank you!
It's nice that you can switch DE's easily with Linux. Makes it a lot less intimidating to choose one!
2014-2015 Macbooks are/were problematic? Uh oh. The computer I'd be using is an early 2015 Macbook Pro Retina, 13". A1502.
Thanks for all the Ubuntu info! Yeah, that's not as concerning as I'd thought, but it still doesn't sound like the best choice for me. Based on a lot of the other comments here, I'll probably end up going with Fedora or Mint.