You said why have most people who have had the ahb2 swapped to the timekeepers?.That is an absurd statement, not backed by any evidence other than some YouTube reviewers you’ve heard (links please). Trolling usually follows such a path. Absurd statements based on some anecdotal ”sources” guaranteed to get a rise out of some people. Now you are saying that it is somehow our intellectual requirement to take your initial statement seriously and, if we don’t, you are justified in wondering about our intellectual abilities!
Plenty of data is available on the Benchmark amplifier, little on the Burson. Generally speaking, modern well-designed/constructed amplifiers will sound the same if level matched and compared in a blind testing. You will pay more for extended warranty, longevity, company reputation in dealing with faults and component failures, features, construction materials and, unfortunately, for snake-oil claims.