I believe the marine product is just a double dose (more concentrated). Correct me if wrong.
Stabil marine has 2 times the inhibitor and 4 times the cleaner of regular stabil.
I have always used PRI-G (gasoline) or PRI-D (diesel) and just read that The PRI-G has worked to prevent the phase separation in ethanol crap gasoline. I think I’ll stick with my PIR-G.