I don't think there is too much to think about...they probably are both good for the job. I personally would probably go for the NAD, but its not a huge decision.
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Have your AR's been restored...foam surrounds and caps? You want to get the most out of them and make them easier to drive. The AR is not an efficient speaker.
The NAD is an efficient amp and puts out more power than its rated 30 wpc and may be able to drive the 10" woofers w/o any difficulty.
The Sansui 666 is from the 70s and would make for a nice vintage system. If at all possible, try and audition the Sansui with your speakers.
How large is your room?
I'm just curious as to why the vintage gear? I've done some experimenting with vintage pieces myself, and the only type of components I thought worth buying were tube amps. Didn't care for anything solid state or even tube preamps. To be fair, I haven't heard the NAD in a very long time, and never heard the Sansui, but I don't see why they would very different than similar products I did listen to.
The Sansui AU series is highly regarded for its sonics and build quality. They are not completely neutral sounding, more pleasant sounding than explicit, but they do provide long-term musical satisfaction when matched with sympathetic loudspeakers. I use an AU-999 with EPI 202s and I suspect your ARs will be a good match. I've never used the phono input so I can't comment.