New Alliance would have the heavy stuff- let's say the Wasp Dropship- that's got heavy armor, big guns, and all that. The Euro-East would likely have the lighter, faster aircraft that rely more on electronic warfare and shields. More likely, it'd be Euro-East aircraft used for drops on planets with no notable lifeforms other than plants or small animals- on planets with creatures evidently roaming around, New Alliance dropships would be called in for heavy air support.