I don't know whether the frame style is stronger or not. The stitch and glue boat is certainly strong enough, as I used it for eight years, then sold it to a friend who is still using it. Plus, the chine on the stitch and glue is much, much, much stronger and more resistant to rock hits. It's a stout boat when finished.

On the inside of the boat, you don't want frames and floor boards. Stuff falls down, they trap sand and are a pain to clean out, and they wear, requiring refinishing. The stitch and glue floor is much more comfortable because it's flat, just like a fiberglass boat.

I think the S&G is faster to build, too.