I have purchased hives/hive sections from numerous outlets. Each product differs. I have 'nationals' from Thorne, Peak-Hives and Caddon. There are workmanship and wood quality/density/colouration differences in all of them.
Personal and ethical approaches as to why you may purchase from a particular supplier may contribute to you purchasing decision. I know that when I purchase from UK workshop such as Peak-Hives that I am directly paying the craftsman and supporting UK manufacturing. I know when available they obtain cedar from the Chatsworth Estate, thus reducing the environmental impact of transporting wood from the far east.
Overall I tend to purchase hive parts from Thorne. Happy with the quality and the price you pay for that. Stock availability at Thorne is never an issue whereas Peak-Hives you may be waiting 6 weeks
Caddon have their hive products 'temporarily out of stock for at least 5 weeks now. Interesting to know what their definition of 'temporarily' is.