Archers all the way. If the rest of your army falls due to whatever reason. Archers kiting can still retaliate and do major damage without taking many losses themselves due to kiting. You can't really do that with Albowtrosses, due to their shorter range and lower speed.
The extra health offered by Albowtrosses is irrelevant too, due to the fact that they will be behind other units, so it would allow them to survive a single explosion, but if you let a mage into that range without moving your weaker units, you should re-think your micro. The only useful aspect of Albowtrosses in my mind is their armour-piercing capabilities, which I really only use against mass giants or Speartons.
Indeed, archers kiting is good for retreating as they provide counter fire that may scare the chasing enemy off
if you used albowtross instead it cannot be achieved
I usually get albowtross when I have a giant at the middle, so they can get a cover