It’s blasphemy in some circles, but I never recommend Ubuntu. Mint seems much more straightforward and easier to make it feel like Windows for new users. There’s a Debian-based version if you prefer it.
I run Mint (Ubuntu version) on a couple of old laptops. But I use Debian on a Linode (Akamai) cloud server for a little hobby project. It’s a good distro.
I’d forgotten about the bootloader. I only dual booted with XP for a few months before wiping the drive and dedicating that machine to Mint.