I played it but it's honestly been a while. I don't remember too much about it other than it shows her in Midgar like a step behind the main group it seems. It kinda goes into why she's there and the people she knows.
I doubt either would spoil the other, especially considering Rebirth should still more or less follow the original game with broad brush strokes.
You probably don't even need to do it at all if you don't want to.
but if you really want to do it, it does chronological take place during the events at Midgar. It shouldn't take long to do it either.
Too late, I started Rebirth over the weekend. Wish I knew about the demo giving bonuses beforehand. Oh well. I just got the chocobo.Slight update...there is a bonus if you complete Yuffie's DLC....pso maybe just go ahead and take the time to do it before playing Rebirth. Shouldn't take long.