You will get 100% different info from the two of them.
Hart rifles barrels is a Barrel manufacture...RW Hart Rifles builds rifles.
I agree with TREBARK about his comment about Hart barrels.
If your looking for a rifle builder I would highly recomend you spend your money once for a quality build and go to Kevin at Montour County Rifles. (570) 437-2010. It's allot easier to build it right the first time then it is to make someone else fix others "F" ups. I've seen some guns roll into kevins made by others that I wouldn't piss on if they caught on fire....
He builds all my stuff and many others on this site. There is a reason why you don't find guns from some builders on here very often