All my PSA uppered, FN CHF barrels have been better then expected precise shooters. 308, .223 Wylde, and 5.56
I can't say the same about my various BCM barrels precision. They are well made and I would trust my life to one.... but I caught the precision bug ages ago, so I am biased.
The BCM barrels aren't horrible at all , its just the FN CHF barrels tend to shoot a greater variety of ammo better and tighter groups in mine. YMMV !
For the OP.... I'd be plenty happy with the PSA FN barreled upper. It is a great bargain.
I would also be quite happy with the BCM... I own a few. For that matter, the BCM ELW Fluted 14.5" upper ( ? ) is a very well balanced AR15... heck I can tell the difference even when compared to the 16" ELW Fluted upper the balance is so noticeable.