My buddy plays on PS4 and I play on the One. I went over and tried all the Sony exclusives. That dust palace strike only has one extra room of extra content :( the boss room where you fight the flayers. The rest of the strike takes place in the buried city mission (i believe) just paced differently. The black garden strike was also all in the same area's excluding a few rooms. You just run the black garden backwards. Its not really worth getting too upset over missing out on the exclusives really. Excluding the weapons of course.

Same boat. I bought Destiny on my xb1 since that's where all my friends play. My ps4 was purchased for exclusives for the most part. I haven't started on the ps4 since I'm not ready for another grind. #thegrindisreal