I think Simmons is much better than we thought.
I was very skeptical of his shooting, still am, thinking that you can't be a superstar in the league without a jump shot (boy was I wrong, I saw Giannis again and...), after seeing BS pierce the defense with all; speed, skill, and strength, I think he can.
I changed my mind and would put my money on Simmons now.
I love Jaylen, in many aspects, but he rarely lands properly after leaving his feet vertically (a bit frustrating, and it can lead to injuries longterm) and he doesn't have a natural finishing touch and vision. It will have to be taught. It is not "inborn" like it is with some top-shelf talents (Kyrie for example).