Was expecting black and white photos of Jim Thorpe.
Tough quesiton. You can't go wrong with any.
For a pure half-back, Barry's vision and ability to cut back and stop on a dime is a given.
I would argue marshall is the more versatile of the three.
I would argue LT's was as much of an all-purpose back as Marshall, and a lot more explosive.
If I had to construct an all-pro fantasy team I'd probably take Barry as a pure hb.