How to get the same photos on my iPad as my iPhone?

I have a 4th generation iPad and an iPhone 5c. How can I get all of the same photos on both devices without repetition?

Two ways… Import photos to computer then sync them over to other device through itunes or sign into icloud on both devices turn on photo under i cloud and stream them. Icloud stream is only good for 1000 photos and only retains them for 30 days. Synced photos can only be removed from device by unsyncing.

Sign into the same Apple ID on both & have Photo Stream enabled on both.