Monoblocking is a "modern" way, although the process is actually old. A barrel set made via monoblock should be just as good as any other, care and skill of work being equal. If the monoblock is welded, then the seam becomes basically invisible. Choppers will likely command extra respect because the fashion is well set at this time.
If the issue was excellence of construction, then one piece barrels would be the top-o-the-heap. Guns are no longer just tools - they are pieces of art and craft. So, fad and fashion must apply.
