There is some truth to the end cap vs barrel band accuracy debate.
The better accuracy from an end cap model applies to the end cap mag stud versions, when compared to a carbine barrel band with full mag model. It has to do with pressure points and barrel harmonics. There are so many other variables at play though that an equal comparison would be hard to make.
For me, any end cap mag stud version Marlin with Ballard rifling has always been more accurate than any other variant, Regardless of calibre.