Backup PS Games - i downloaded psp games from the internet as a backup and was wondering what is better cso or iso??

i downloaded psp games from the internet as a backup and was wondering what is better cso or iso??

is iso better quality ? and if so is the quality of cso bad? is iso much bigger that cso or just a little?

CSOs are just compressed Isos....so there isn't much difference....
not alot in diffrence but i say cso
download.com y8.com crazymonkeygames.com
if u have a smaller memorystick i suggest cso(they take less space)
iso is definetely better. Diff between that and cso is that cso's are likely to become corrupt from copying from 1 drive to another.