Either way, I would remove the tree on the right. Unless you have 1 ft of mulch, the right tree is likely a late developing embryo from the rootstock's seed. If it is not, it is really doing much for the tree. It is a VP and will not be disrupted by the removal of a secondary limb. I think the nursery that propagated the tree missed removing that when it was in the field and again when shipped to the Lowes store. I have seen the same thing happen in trees I got from PIN. I ignored some potted Venus trees for a summer and had to remove a few independent rootstock shoots.