http://hifiknights.com/reviews/amplifiers/pass-labs-int-25/Direct comparisons here and 6moons builds on this review.
Bakoon will be quicker, more detailed, better extension, and a little better separation. It’ll be a more flashy, colorful.
The XA25 will scale up better (more powerful) little more bottom end. Denser images. Warmer relative to the Bakoon, more matte.
Preference and synergy ..
The original 6moons article on the XA25 has some more comparisons vs. other Pass or FW that you can use as a reference. Same with their Bakoon review.