Teach me the difference in Supra boats

The SR is clearly their small boat.

But what is the difference between the SE, SA and SG

I recognize the difference in lengths. And the bow design. But is there one boat that is designed to be the superior surf boat? Is it just a difference of size and bow shape(picklefork vs blunted)?

The SA has the surf locker at the transom, so I'm wondering it that suggests that it is the superior surf boat.

For a SA is the 400 motor too anemic? I'm only at 300-400 feet above sea level.

I am really leaning toward an SE. But want to make sure I make the right decision.

Thanks all!