Vagyr Battlecruiser Tree---Research Module, research hyper gates, build hyperspace module, construct shipyard, build capital ship facility, research battlecruiser, build battlecruiser
Hiigaran Battlecruiser Tree---Construct Research Module, Construct Advanced Research Module, build hyperspace module, build shipyard, build capital ship facility, research battlecruiser, build battlecruiser
Same amount of steps, but the hiigarans can do it faster last I timed it _myself_. Besides, the Hiigaran Battlecruiser is better, with its turreted stuff. Just build a few bomber squads, take out the Vagyr BC's missile launcher and engines, pull the BC where u want it, and just blast away and it can't do anything about it. With dissabled engines and the top ion cannon out(the only one targetable), the Hiigaran BC can still own stuff, whereas the Vagyr can't own squat.