Best is always questionable, just because something is better suited for me, doesn't necessarily mean it's going to be well suited for you. This is where a lot of info is misconstrued online. The tuff part is picking through the rubble.
The performance "gain" in the XG50 wasn't enough to upgrade to from an XP50 IMHO, I have also had numerous people tell me this that were direct customers.
BAE, TAU, BOSON, ULIS, MATRIX III, which is the "best"? I could literally run though each experience in great detail on the optics I've used with the above, and nit pick what I like better. But then again, Since I'm all about clarity, and performance in adverse conditions, all while obtaining footage to later expose it, that definitely doesn't mean it's going to suit others needs.