I am thinking of getting a 7S fish I have heard the 6'' and 5'9 are great but the 6'3 is a dog.Its the 6'3 I was looking at is this correct.Thanks Rod 91kgs

I think it has to do with what your comfortable riding-

If your a small scrawny guy that rides an itsy bitsy thruster yeah a big(ger) fish is going to feel like a dog.

I have a surftech Macfish that is similar to the 7S that I ride in a 7'2" and it's a great board (I'm 100kg or so). I've got a friend that rides the 7' 7S and he loves his board.

All depends on what you want to ride with it.