I'll say this about Bio Broli:
It has the best animation of the Broli trilogy. And not by a little. Movie 8 is almost a disgrace (back me up, Zippy), especially on blu ray where it stands out like a sore thumb. Movie 10 is an improvement, but they reuse animation from the last Broli movie, particularly when he turns LSSJ. It comes off as cheap and takes me out of the movie, especially when I watch them back to back.
Bio Broli looks like a great DBZ episode. I have always found it the most watchable of the three.