Theres good post about systemd-boot vs grub here on forums which goes over pro’s and con’s;
Grub or Systemd-boot?
From my experience, systemd-boot Just works. It’s more robust and simpler.
Grub is more configurable, but also is more complex and can go borked easier over multiple things. And then there was that grub update thingie that broke booting for many and forced to fix it with chrooting.