First a Majority of the type of troops are ground units
Second the main advantage of an xbow is the range
Xbow on Ground & Air is just an archer tower with 1 tile range increase
Xbow on Ground has incredible coverage and can quickly dispatch low health troops due to its high hits per second, i think its 10 per hit on the 80 dps upgrade.....so it hits a target 8 times in 1 sec, thats great for low health troops, not for medium/high health troops, like loons and drags
basically u are giving up the sniper of ur buildings army by setting it to ground/air
instead just upgrade ur AD and have good trap loon protection
