It would of been perfect if in every boss fight there was a tiny spot somewhere that if you held a button it would grant you access to your Drop-Me-Nots/Nevers. In Traverse Town I was so confused. For hours I'd search for treasures and focus on leveling up and play with the incredibly adorable Spirits! Four or five Drops later when i get back to the story I had the nagging feeling that I'd already been here and that I was going the wrong way. Luckily the Information button is a life saver! After Traverse Town it got a lot easier to remember, and it became exciting to be rushed against the clock!
Starting off in BBS I was a bit confused when a character visited a place when, but after i found out there was a timeline i was saved. I was so focused and enthralled with the story i kept at it instead of getting treasures. I think the curiosity of wondering what the other characters did before or after you and what was going to happen next in BBS was a bit more suspenseful altogether than DDDs Sleeping worlds with Riku and Sora there at the same time.
Sora and Riku are together and helping eachother out, If the play-through was like BBS the sense of connection between the two is lost.
Terra, Aqua, and Ventus are more torn apart in their friendship, so it was appropriate to view their stories in a separated sense.
so yeah, both are perfect for there stories, i chose both.