Why do they never run into another version of the queen true love Daniel?
Because he had been killed by Cora before Regina even became the Evil Queen. In fact, his death was what drove Regina to become the wicked person she was. On the other hand, Wish-Robin was alive because he was in a made-up world where Emma never became the Savior and the evil version of Regina had been vanquished (but even in that reality, Daniel was dead).