The trouble with either of those sites is that Yuku doesn't have a migration tool and it would be necessary for a fresh start in which all would be lost here.
Aimoo's migration tool archieves this group over there but you can't post replies in the archieve although it would be preserved for future searching within those files.
The decision is up to everyone else.
At least, for now, the files and pictures here are saved on Multiply.
FT