Neither, they both taste terrible
Better in what way? From my limited knowledge of undersea creatures, I believe that running into a eel would be better than a sea snake. Sea snakes are almost always venomous, whether it is a mild venom or, in many cases, one of the most toxic. Eels, on the other hand, are not venomous, but can deliver a nasty bite if you offer your hand.
I'm not going to find out cause I'm not going in the water!
Electric eel.
Ever wonder how they could possibly ever mate ?
All life is seicret and cannot be replaced.