Although I don't own any Kreiger barrels, I know from reading comments from those owning them that they are fine barrels.
I do own many Hart barrels, in centerfire and rimfire, and they all shoot extremely well. I bought my first Hart barrel in 1968, and being a loyal guy, will continmue buying Hart barrels.
I had four Hart barreled benchrest rifles over the years and they were as competetive as any barrels being made. One of the most important aspects of a rifle shooting well is the gunsmith who chambers and fits the barrel. A sloppy chambering job can ruin a rifle's accuracy no matter what make barrel you use.
The folks at Hart have always treated me very well since 1968, so I will continue treating them well by buying their barrels.
Incidentally, Jim Hart at Hart Rifle Barrels is a VERY good gunsmith who I trust to chamber and fit their barrels to any rifle made. Jim is the son of Paul Hart who runs Hart Barrels. Paul's father was Clyde Hart who started Hart Rifle Barrels. My first custom barrel was a Clyde Hart barrel.
Martyn