I do not think there is a difference between the two in accuracy.
There may be between the two designs.
If you look at two similar sized guns:
A compact auto and a J Frame 2"
The sight radius for the Auto will be longer making it more accurate.
But at the short range you will be using the gun I really do not think it will matter.
If you like the revolver and are comfortable with it ....
If you are a semi auto guy and like the features of it then get it.
If you want the semi and want the 357 power and like 9mm get a 357 SIG.
9mm bullet driven to 357 mag speeds out of an auto.