P.Sho has better damage and his persona normals are decent, along with a +3 or 4 teleport slash along with all of his other good normals. Sho has the teleport mixups, better use of 25 meter with ex helm breaker and ex grand viper. They both have pros and cons.
The difference is that P.Sho is a bully while Sho is a shithead. P.Sho bullies people with his normals and jump cancelable B normals, and the threat of grab and command grab to get them to make a wrong defensive move. Coupled with fullscreen persona harrasment, chasing knife, and his fantastic normals in neutral, he excels at harassing people and getting hits. When he does hit you, especially with meter, it hurts. There's nothing "gimmicky" about him.
Sho's damage is slightly lower, and he has a harder time using super midscreen. Most of his meter goes towards his ex moves. Teleport left rights don't lead into crazy damage but they lead into some decent damage. He lacks full screen stuff, but he can make his way in and do a less damage using better mixup.