Difference in geography, for certain, and related demographics.
Mr. Williams had a
hunting rifle in rural West Virginia, where imho many people own
hunting rifles. Not in WV myself, but for families in my area, a
hunting rifle is a tool used to feed one's family.
Hunter Biden, iirc, lived in urban Washington, D.C. imho few people in the District own a concealable Colt Cobra .38 Special. A concealable Colt Cobra .38 Special is a snub-barrel revolver that literally fits in your pocket. A concealable firearm is a likely choice for personal protection & home defense.
Not sure the precise model Hunter selected, but here is an image:
View attachment 435192
Colt Cobra 38 Special 2in Stainless Revolver - 6 Rounds -The Colt Cobra established Colt's triumphant return to the world of double-action revolvers. Its small frame and 2in barrel make it ideal for concealed carry. The Cobra is chambered in .38 Special and is +P capable, with a rubber wrapped...
www.sportsmans.com
The Colt could be carried past anyone's game camera undetected. Another difference....
jmho ymmv lrr