Gotta go with Stimpy here;
There is a chance that a 925 could be slightly more accurate than the Versa-Pack, but not guaranteed. The NEFs can be very accurate and since it is something your boy could grow into..the versatility of the NEF is a strong point.
With the versa-Pack, you already have a .22 rifle and a shotgun...other things can be added later for bigger game..20ga both shot & slug.
I personally, would not be afraid of certain centerfires...but I leave that to your discretion..