It’s mostly personal choice but I find it easier to configure and it’s certainly more lightweight and faster than GRUB (although probably not by a noticeable amount). Since I don’t need BIOS support I prefer to use it.

I usually replace these:

1. Bash with Fish
2. Neofetch (if there is) with Fastfetch+Hyfetch
3. Firefox with Floorp
4. Mkinitcpio with Dracut
5. GRUB with systemd-boot