ATR specializes in accurate rifles (really accurate, at distance) I'd go either with their in house or Armseast, you have a better chance of two things:
A) getting a barrel that will shoot because production volumes are low, and the tubes are handled by people who know what they're doing (as opposed to mass produced barrels)
B) Getting strong customer service, because that's what both companies do.
I know Questar has in house barrels too, so add them to your list. One thing to be aware of, chrome lined barrels are not famous for accuracy - that lining is designed to reduce the effects of heat and wear, not improve accuracy, so it's rare to get a hair splitting barrel with a chrome lining.