Which is better between the Bryston and the Mac I don't know, as I haven't heard the Bryston, but Paul's statements are subjective at best.
Yes the 14 b sst has a twenty year warranty the bryston is more reliable ...This doesn't mean the Bryston is more reliable.
The bryston the 14b has more power 108,000 MFD of filter capacitance per channel...Specs do not guarantee good (or better) sound/performance.
plus the Bryston has the reviews to back it.So does the Mac.