Bryston VS Odyssey

has someone compared these two amp side by side, what's your suggession?. I heard my friend said that he found a lot of posts telling Odyssey over Bryston in term of performance, eventhough the THD of the Bryston is smaller than Odyssey. Does the THD tell something in audio world? is that true the smaller the THD the better the amp is? How about a other ultra high end company, I found their product rates with much higher THD than Bryston, but the price is more away from Bryston and then I don't understand why the Professional reviewer (reviewing the most ultra high end product) supposingly they claimed it sounds better even the THD much higher than other brand. Does the price of the product they review is a main factor leading them to believe the ultra high end amp sounds top-notch than other brand such as Bryston and Odyssey. I really don't understand, or because we don't have a chance to listen to those ultra high end amp therefore we have to believe and follow what the professional reviewer said, and beside I believe the specs tell the whole story about how good and capable the amp is? I'd like to have people like you to verify abovementioned point with me.
Let assume Amp A and Amp B they have same specs, but different THD number, A got smaller than B. which one U believe is good, and do you believe there is a difference in sonic performance.
Thanks for attention.