It depends, 5 gal is it for 12x12x12exo terra?

Anyhow
cranwelli - have bigger "horns", huge amount of different morphs.
ornata - more roundly shaped body, majority grow bigger in comparison to cranwelli, as well majority of ornatas are more aggressive eaters. However there are way less morphs.

Adult male cranwelli can be perfectly fine in 12x12 exo terra all his life. In fact I think my male ornate would be fine in that size too, he is one lazy dude, he only needs water dish (rarely) and one spot to put his big butt in, all the rest of his 18x18 exo terra has never been used.