It sounds like they're saying that they would end up being a better parent because it's a clone, not because they know it's a clone.
The OP has no way of knowing if they would be a better parent, but yet they still very strongly think that they would be a better parent to a child that has 100% similar dna than 50% similar dna. How can you know this unless you are biased towards the idea of a clone? "I want a clone, more than anything" suggests there is bias.