Which version is Correct ?

To avoid getting into long hours of dialogues with so called Christian apologist, ask them this simple question :

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You say you have the Original Torah which was given to Moses Pbuh, THE TEN COMMANDMENTS were also given to Moses Pbuh, that was engraved into Two Tablets which is found in Exodus 20, In Order to verify that the bible is True we would like to compare the Two Tablets of the 10 Commandments with Exodus 20 so we know there was no alteration or changes made... Please can you show us the Tablets that Moses Pbuh was given by God Almighty. 

Don't flood them with anymore questions keep it to that and let them provide the evidence ! Watch how they struggle to answer or turn to insults but, if they do reply back saying even though we don't have the two tablets we know exodus 20 is at its original state no changes has been made.... 

Counter them back by saying how do you explain this then Which Commandment was engraved in the Tablet the short or extended law?

"You shall not covet your neighbor's house. You shall not covet your neighbor's wife, or his male or female servant, his ox or donkey, or anything that belongs to your neighbor."( Exodus 20:17 Masoretic Torah)

------------ Extended Version ---------------- Thou shalt not covet thy neighbour's house, and not thou shalt not covet thy neighbour's wife, nor his field, nor his manservant, nor his maidservant, nor his ox, nor his ass, nor any thing that [is] thy neighbour's. And when it so happens that LORD God brings you to the land of Caanan, which you are coming to posses, you shall set-up there for you great stones and plaster them with plaster and you write on the stones all words of this law. And it becomes for you that across the Jordan you shall raise these stones, which I command you today, in mountain Grizim. And you build there the altar to the LORD God of you. Altar of stones. Not you shall wave on them iron. With whole stones you shall build the altar to LORD God of you. And you bring on it ascend offerings to LORD God of you, and you sacrifice peace offerings, and you eat there and you rejoice before the face of the LORD God of you. The mountain this is across the Jordan behind the way of the rising of the sun, in the land of Caanan who is dwelling in the desert before the Galgal, beside Alvin-Mara, before Sechem (Exodus 20:17 Samaritan Torah)

( note if the two tablets are missing how can you even trust what is written without any additional reliable source of verification?)