You want boot2 for 100% brick proof, or near 100%
but boot2 doesn't work on all Wii's, test to see if your Wii can support bootmii on boot2 with this http://static.hackmii.com/bootmii_check.elf
rename it to boot.elf, put it in apps and in a folder and that's it.
run it and if the long string of numbers and letters after boot1 doesn't start with f01e you can install it as boot2