I personally chose my Bfe, as I'd been looking for ages, and if I was lashing money on a new frame, I wanted to get it right, by that I mean buy what I wanted, effectively my Bfe was twice as much as a OO456, I loved the design features, well thought out features, the clean and almost retro lines, the wishbone rear, the colour, Cotic seem to care more about their brand too. It all adds up. equally i could have saved money and gone for an NS Surge but Cotic ticked so many boxes for me. I'm still less keen on OO Inbred design and reputation of aftersales/worth of product/geometry/ride/paint, though my mates 456 rode nice on my very brief ride, I'd consider them specially for a SS roadie Pompino or something.
Early OO Inbreds were apparently 853 but too expensive to produce when cheaper 'almost as good' chromos were available. So thats a tad historical now interesting if it was the same factory. Also outsourcing factories often make different brands like Primark and M&S and DKNY say garments side by side in the same factory whats different is what they are instructed to do. Theres still design and project managements and brand mission quality<>value. I'm not dissing On One by the way, I shop with them now and then, I love the way their prices are transparent and put reasonable, good (once niche) producs on offer at an easily affordable and reasonable price. They spoted a gap in the market and went for it! Good one em.
What i'd need to consider is if I went for a Solaris 29er frame at nearly £500, would a £149 One One be wiser... ??? depends on budget I guess