I have both.
I have a Marc Morin AR XB with all the fixin' s, including a custom plinth by Av Fan.
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I also have a sweet Dual 1019 with as custom walnut plinth from somewhere in Europe. The Dual will be getting a trip to Bill's for its 45 year checkup and restoration. It sounds great, very dynamic with great pace, characteristic of an idler. Once Bill works its magic it should get quieter too.
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My AR sounds better by several steps. Marc can make an XA/XB sounds like something special.
In stock form they will both sound very good but different. Both stock, both running properly, it is pretty close. My preference is the AR but the Dual is fun and a great automatic with changer option.