IMO, if we are to use a prefix, it should ONLY be N and not NXT, and then there should be no dash between the N and the rest of the account.
Then it will do nothing for branding, because it will just look like part of the address (that's also true for the ridiculous NxxxxXxxxxT scheme).
I also prefer short addresses, but since some people strongly believe in branding we added an optional "NXT-" prefix.