I wasnt circumcised but have a small foreskin so i have the best of both worlds.
The stimulation angle is that with an exposed glans will get desensitised a bit by being rubbed on clothing etc over time, but it is very minimal and probably an advantage sexually to have it dialled back a little anyway.
As long as the man keeps it all cleaned properly it really wont make a difference. there's the aesthetics obviously and i think a small foreskin with exposed glans is the right combo functionally and aesthetically, but then i am biased.