ATI AT2002 vs Bryston 4B ST

Has anybody had the opportunity to compare the sound of the 4BST and the ATI AT2002 amplifiers?

I have read in some posts that Bryston sounds similar to ATI but none of the posts was an AB comparision with the same pre, speakers cables room etc.

Has anybody done an AB comparision?

Many thanks
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Thank you for your reply. I have a pair of Usher BE-718 that I will be driving. Use a Benchmark Pre as my pre-amp. No intention to chane the speakers or pre at this stage.