When Cook’s Illustrated tested an Accolade 400 in 2005 they found its performance about the same as the Artisan, but they preferred the Artisan. If the two mixers were the same price, the Artisan would probably be the way to go. If the Accolade is a lot less than an Artisan, it is probably a pretty good deal.
The Accolade’s motor head is based on the Professional 600, and I consider that a good thing from the standpoint of fairly simple repair compared to an Artisan, but I have not been able to determine if all the motor and gear parts are shared. I doubt if KA would make it an orphan with parts that are totally unavailable.