That’s quite a binary choice you’ve got there: 6-ch, minimal, used, cheap … 5-ch, boutique, new, hella-expensive!
Not to derail this thread into a general discussion of mixers, but the Prime 5 is hardly “multi-purpose” - the channels are not very flexible. You could easily buy a high quality mixer with much more flexibility, features, and channels for a ⅓ the price or less.