[snazz]

systemd-boot is a good solution to this problem. It's less of a horrible complicated mess than GRUB. You can add menu entries for multiple operating systems, an EFI shell, and the BIOS menu, just like with GRUB. It has a much nicer configuration story and integrates with the other systemd components (so, for example, you can reboot into a different boot menu option through a systemctl reboot flag just like the equivalent feature in Windows).

systemd-boot only supports UEFI systems, so GRUB would still have to be an option for legacy systems.

Check out the Arch Wiki page: https://wiki.archlinux.org/index.php/systemd-boot

[Nextgrid]

I kind of wanted to mention it as what I think is a better alternative but I feared it would label me as a systemd propagandist (given the polarising nature of it, even though personally I think it’s advantages outweigh the - often philosophical - drawbacks).

[snazz]

I think that anyone can recognize it as a good alternative for Ubuntu, since Ubuntu already uses systemd (and that's a done deal).

I'd consider myself a pragmatist, so I like systemd because it makes my life easier with the declarative configuration and other nice features (although I recognize that it makes some people's lives harder).