i'm a fan of both...i recommend both...i have both installed on my wii....since your wii is 'several' years old, i imagine you can install bootmii@boot2, which is good.....
what each gives me:
bootmii@boot2: boot into sneek and the ultimate in brick protection....
priiloader: autoboot directly to USB loader (wiiflow), enable hacks to allow me to move the disc channel (which i rarely use), play other region games from discs, blocks system updates from discs (in the event someone else were to pop in a disc, it won't even prompt them to update...), (auto)boot into HBC....
what each gives me:
bootmii@boot2: boot into sneek and the ultimate in brick protection....
priiloader: autoboot directly to USB loader (wiiflow), enable hacks to allow me to move the disc channel (which i rarely use), play other region games from discs, blocks system updates from discs (in the event someone else were to pop in a disc, it won't even prompt them to update...), (auto)boot into HBC....