I have some g12-65s, UK GBs, and V30s. Also have a CB65m, my least fav. I like g12h30s a lot in open back combos or cabs, and dig the H75 quite a bit.
The 65s are the quietest, less barky than GBs, with more and smoother mid content. They really sing with some volume.
V30s are my fav. I'll always have one, but like to mix others with it.
I actually have 2 4x12s with the G12-65s, dated 1979/80. I'll probably be putting those cabs up for sale soon. May consider selling the speakers separately. Will also be selling some UK GBs.