My guess is that the audiolab 8000s will be rather more precise than the NAD equipment. Lall is correct that the company was taken over and renamed ... you'll find that TagMclaren still support the audiolab products. Have a look on their website.
I own an 8000C preamp and have used an 8000A and they're very fine amps ... at the artech price they will not be beaten. However it is not by any means a warm sounding amp, so you'll have to pick speakers that have reasonable bass response to avoid a thin sound. I used to own a NAD 3020 ... the audiolab 8000A was a much better amp, but in the end I got a Cyrus2, which had a bit more dynamics than the 8000A.
I own an 8000C preamp and have used an 8000A and they're very fine amps ... at the artech price they will not be beaten. However it is not by any means a warm sounding amp, so you'll have to pick speakers that have reasonable bass response to avoid a thin sound. I used to own a NAD 3020 ... the audiolab 8000A was a much better amp, but in the end I got a Cyrus2, which had a bit more dynamics than the 8000A.