Cleanrip makes a 1:1 ISO disk image copy of your games. The backup loaders' rip functions usually do it in WBFS format which is smaller but if you wanted an untrimmed ISO image later you could just convert it with Wii Backup Manager so I don't really see that much benefit the Cleanrip way unless the backup loader's rip wasn't working for you. In that case you could always see if the full disk image got it working.