safer because users often do wrong things when installing wads (wrong file, wrong console, wrong version, wrong uninstall, etc.), or over-fill the memory (though, there's a safe guard if that happen to uninstall channels before loading system menu). But if the user is careful, then even officially updating or writing a savegame to the NAND can be as dangerous as installing a wad. the console should have a map of bad blocs, but you don't know when a new bloc becomes bad and write fails. on vWii, what's dangerous is that there's no priiloader or bootmii to load homebrew channel at the start. if you install a channel with a bad animated banner script, then your console will not boot anymore ! this is a "banner brick". on wii, there's always a way to delete the faulty channel before loading system menu, but not on vWii. You can test the animated banner using Sneek, or by installing it on Wii first. (not by testing it in system menu emulators like USBLoaderGX or other banner reader as they are less picky with script errors. the wii crashes while banner emulators have proper checks to prevent crashes) sometime is just easier to launch the channel from EmuNAND and don't bother setting up and testing on Sneek.