There are some elements from each that are good. BI has more naval activity, whereas ALX's AI retrains it's units instead of always recruiting new ones. The cool thing about BI is the extra formations it has, like Shieldwall and Schiltrom. When the next full version is released, I'm potentially planning to make a modded version for people who have BI that takes advantage of these new formations (after all, wouldn't it be cool to see your Huscarls form a shieldwall like at Hastings), and maybe even take advantage of the extra faction slot given by BI, who knows
. All hopefully with LOTK's consent of course.