Brunitron is the standard "blue" type Beretta finish. It is some sort of baked-on paint and holds up relatively well. The military selected, as I recall, a "B" grade polish / finish to cut down on glare and expense. The many "Police" packages available to LEOs (gun and three mags in cardboard box) also have the military finish. The Italian-mfg. commercial guns have the high polish and more attention paid to little details such as grip screw alignment, recoil spring ends buffed off before installation (no joke!) etc., and, while prettier, are no better or worse than the US guns. US commercial guns have, supposedly, an "A" grade polish. Older Italian 92Fs were blued and used roll pins. US guns are all Brunitron (if "blue") and use mostly solid pins.
Beretta USA will probably also go through the gun and replace anything not to factory spec...possibly for free. If it were me, and I liked the gun, I would go for the factory refinish.