Im no expert but i would think the MGff/m would be better suited to blow off wings. The MGff in game has only incendiary ammo, sure one is explosive too but still its called Brandmunition (Brand= Burn). The Minengeschoss of MGff/m had much more explosive power. I dont have problems in game to set em on fire. But still im looking forward to seeing the effects of MGFF/m once we get a 109e4
check here too: M Geschoss has a lot more explosive power.
http://www.quarry.nildram.co.uk/WW2guneffect.htm