Are you in a state that has some form of the 1994 AWB still in place?
If so, the "preban" gun probably comes with standard capacity magazines. (15 rounds in the case of the Beretta)
The new gun will likely come with neutered ban mags at a reduced capacity.
So it would depend on whether you want the magazines the gun was designed around or not.
Personally, I lucked into a pile of Beretta 92 military magazines during the AWB and I bought a gun just to be able to use them.