For resale, guessing the McIntosh. The McIntosh is a great down the middle of the fairway amp. I have one and listened to many. Not exciting or toe curling. Very little deviation in dynamics through the volumes. Nice and flat.
Haven't listened to the Accuphase so don't know.
Hate to go there but what about neither? Such wonderful efficient speakers that are going to have more power than they need, imho. That is unless you are just looking from some greater decibels.
Have you thought about a low wattage S.E.T. tube or something from First Watt? Audiophiliac does some reviews of the Cornwalls paired with various things and nice results from Decware.
Good luck and please let post what you end up with and how it sounds. Either will be great.