What are some alternatives?
When comparing GRUB and rEFIt, you can also consider the following products
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.
Visual BCD Editor - Visual BCD Editor - advanced GUI version of bcdedit utility. for Windows 7/8/10 and Vista
Grub Customizer - Grub Customizer is a graphical interface to configure the GRUB2/BURG settings and menuentries.
PLoP Boot Manager - The PLoP Boot Manager is a small program to boot different operating systems.
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
EasyUEFI - Manage EFI/UEFI Boot Options & Manage EFI System Partitions & Fix EFI/UEFI Boot Issues