B&W N802: Which amp??

Not wanting to start any religious battles over amplification however if your choice is constrained to those 2 I would choose the MC402 given life-like and organic nature of the sound and many other likeable qualities. You may also wish to consider Classe M400 monos or their latest stereo amps as they make a particularly good pairing with the N802s (and other B&Ws as well)...I don't know your price point or your music listening prefs so sharing a bit more info may help you...

Also check out the VTL lineup.

The most powerful amp you can buy and afford...B&Ws need juice!

Dave_72 is right on the money, the more power the better, mine love their power.