No particular features. Some will argue better glass, but that's a matter of opinion and value. 4800$ for a 5-25 PMII seems steep to me, but maybe they've shot up.
Both are like looking into the face of God. Both are tough as nails and battle proven.
The $4200 plus tax ($4800 after tax) S&B model has LT/MTC/DT/ZS
You can get one with no ZS/LT/MTC FOR $3900 plus tax.