I would have prime for just the free shippingI do that for almost everything. None of these services have content I need/want for a year but all of them have stuff I want for 1-2 months. Paramount + is definitely only in that for me because of Star Trek, but I did enjoy The Stand series too and streamed the Godfather trilogy one weekend when I had a cold.
Prime I always have which works out for older Star Trek...at least for now.