The sentence that shows the correct use of possessives and pronouns is "Ours is similar to PS Doubt Software, yet it leaves theirs far behind."
Possessive pronouns are the words "my," "mine," "our," "ours," "its," "his," "her," "hers," "their," "theirs," "your" and "yours." They are associated with pronouns related to their writing and indicate a situation of possession.
Pronouns, in turn, indicate a person or something and replace a possible noun that could be used in the sentence.
In this case, the association between the possessive pronoun and pronoun must be made in agreement and this agreement can be seen in the sentence "Ours is similar to PS Doubt Software, yet it leaves theirs far behind. "
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