Mounting a heavy display on a single stud just isn't a great idea. It's heavy.
Is there a need to mount it on a single stud?
Is there a need to have an articulating mount?
Articulating mounts will usually push your display out another few inches too. Will that be alright visually with where you want to put it?
If this is something going above a fireplace in a new home, keep in mind that it's highly doubtful you will have a single stud right in the middle of the mantle.