Mormons don't believe Jesus is Omnipotent the Son of God and also one with the Father and the Holy do they,  and also the Holy Trinity? Do they baptize in the name of the Father and the Son and The Holy Spirit? I don't think so but that is exactly how Jesus and the Apostles prescribed it. Just saying. We can certainly be decent and ecumenical but on some major basic tenets of faith we don't agree. So I would be highly doubtful of visions of Joseph Smith when he started a religion, 1800 years after Christ began the Church with the appointment of Peter, the first Pope. If his vision was authentic, the religion certainly distorted the main basic tenets of Christianity over time.
On the other hand, visons or apparitions of the Blessed Virgin Mary, who was the Arc of the New Covenant and whose faith and great Amen began for us on this earth the coming of Jesus Christ, make much more sense in the overall scheme of things. Any apparition cannot be against the Gospel