Why is there no option to choose both choices in the poll? You can have Bootmii, whether it be installed as boot2 or an IOS, and Priiloader installed at the same time, so you get the best of both worlds, and will essentially give that bit more protection to your system!
Anyway, if you just got a new Wii, you should definitely update to 4.3 and use the Letterbomb exploit + Hackmii Installer to install The Homebrew Channel first, if you haven't already. After that, you should grab either Waninkoko's WAD Manager 1.7, or use Yet Another WAD Manager; they will both install WADs either way.
There are boot.dol versions of the WAD managers you can execute through HBC. I find those the more comfortable to use instead of running around trying to install the WAD version of a WAD manager first.