People tend to buy companies with their own favored product.
I like A2, because it has much more diversified product line than BAL, that's why I sold all my BAL last year and never touched again.
I think A2 has better management, their supplier Synlait was controled by China's Bright Diary & Food (50+% stake), A2 looks after daigou, they made a lot of smart decisions and has got most part right so far.
Compared to A2 and what has happened to the BAL, I would not touch BAL for a long time, just my 2cents.