I have been using outcast floattube fins for years, they are slow but seem to work just fine.
I always read on the bigfishtackle floattube forum that most prefer divers fins.
then I have had a few friends try them and like them. I finally bought somew and tried it out. WOW! they work so much better! I can go much faster with less effort, i will never go back to float tube fins again!