well personally i think the air start is better because its cheaper its flying and it can still be great at taking out the basic order starts, i would go for the fire start if they buffed its range as i noticed even though it is made to kite it actualy has the lowest range out of all....ranged units or at least the deads and archidons :P, i would DEFINATLY go for the start to since the buff but sadly as you can see they nerfed it and im not sure if its still stronger or even weaker compared to the original "setting." and on a side note i noticed they nerfed the scorplings twice which i think is pretty bull the 1st time they did it was by lowering their health but you could regain it by getting the scorpling upgrade which is basicaly where they placed the health, i was fine with that but now they did another nerf on their attack dmg and health again, so at this point their not worth it really.... i would say they need if you must keep this nerf to at least lower the pop of that tree by 2 as it costs 9 right now and i know its known as OP but 9 pop thats way 2 much considering the nerfs to the scorplings....