You can't compare Viberg to OSB. That is like comparing Alden to White's. OSB is an outstanding artisan shop. Their products and customer service is top notch. If you are looking for a comfortable boot or shoe to wear casually or for fashion OSB will fit what you are looking for. If you are looking to put out forest fires and trudge through the wilderness you should be looking for another company. That being said. I highly recommend OSB those guys are great and they back their products 100%
OSB is not an artisan shop. As far as I know, no boots are made on Oak Street in Chicago. Highland makes their moccasin-constructed shoes, and their Trench Boot line is all made by P.W. Minor. In terms of materials quality, OSB cuts a few corners and uses leather that makers like White's and Viberg would discard. Lately they've had significant issues with welt-stitching tension, and while OSB CS is usually top-notch, OSB refuses to regard the issue as, well, an issue. This album (http://imgur.com/a/ovKrt) illustrates their recent issues. It's worth noting that I've heard the boots in the second-to-last picture were eventually taken back for a full-refund, despite their initial claim that it's within-spec.