Let's put this into the spearton-archer versus Shadow-archer thread instead.
For now, let us consider: Is the archer-spearton better than the flier-spearton?
The following is written under the assumption that one player is using archidon-spearton and the other is using allbowtross-spearton
Archer Spearton advantages:
1: Archers can dodge magikill more easily and continue the attack on the enemies unhindered.
2: Archers and Speartons are easily massed compared to fliers and speartons.
3: Can move much faster
4: Also being ground troops, they are relatively more sheltered by spearton.
Main advantage for Flier-Spearton:
1: Obviously, they deal more damage.
Now, this might seem that the game is tilted towards spearton archers, but please consider the micro strategies that can be deployed by both sides.
Spearton Archer micros:
1: Spearton in shield wall with shield bash while archers rain arrows onto the enemy. Easy.
2: Spearton charge at enemies tower while archers kite the main force. Not so easy, but effective since the enemy will have to divide his troops into half very, very quickly. Unless your enemy has good micro, he will probably make a mess of it.
Spearton-allbowtross micros:
1: One or two spearton stay behind the rest to dodge the enemy's shield bash before killing off archers behind. Without archers, enemy spearton are vulnerable to allbowtross. If enemy spearton turn to attack speartons behind, they will have lost their shield wall and will allow more spearton to slaughter archers while allbows rain fire down on them all.
2: Use spearton walls to counter the enemy's spearton walls. Use superior armour piercing hits to kill enemy speartons. If they bring their archers into range with your fliers, they will bring archers into range of your spearton. Victory is assured, unless they have superior numbers or somehow micro out of it.
Now, it appears that at full strength, 80 population, the allbowtross-spearton formation holds an advantage over the archidon-spearton formation. However, we have one last thing to consider: Their retreat. What if the enemy does win because of better micro? What can you do next?
Scenario 1:
Your spearton all die but the enemy still has spearton and their ranged units are not harmed much, or even unharmed at all.
Retreat for archidon spearton:
1: Get out of range of allbows before kiting the spearton. If they stop their spearton to regroup with their allbows, fire at will at regrouping speartons.
Retreat for Allbow Spearton:
1: Umm... Send one or two allbows as a decoy to distract them while the rest gain a lead first? Depends on the map, really, but anyway, allbows suck at retreating.
Scenario 2: You see the battle isn't to your favour and retreat in advance, retaining control of your speartons:
Archer spearton:
1: Send spearton to get back to the base while archers while archers kite the enemy.
2: Send a spearton to a kamikaze rush to the enemy base, drawing fire from enemy allbowtross and keeping enemy spearton away from your archers. Then, make all archers target the distracted allbowtross. More of a counter than a retreat.
Flier Spearton Retreat:
1: Recall fliers first, then have spearton give up and retreat. A foolish enemy shall chase after you; if you time it right, you can use the kiting strategy once before you retreat again. However, kiting with Fliers requires a lot of foresight, timing, and assurance that the enemy isn't brave enough to keep going until their archers catch up. All that work for just one volley when archers can land several; Not quite worth it.
2: Leave one spearton as a distraction while you run.
3: Send all spearton in a kamikaze rush at their archers while your fliers retreat. If it procures unexpectedly good results, such as when the enemy can't disengage from shield wall quick enough, you might even kill enough to mount a counterattack. However, this hinges on the chance that the enemy is a noob.
Overall, we may come to the conclusion that although the allbowtross-spearton combo is better in combat, the archer spearton combo is done more quickly, which forces the allbowtross guy to turtle. And even if the allbowtross spearton formation is formed under turtling strategy, the allbowtross-spearton formation is too rigid to provide many forms of retreat; it is an all-or nothing strategy that you can only use from the very start of the game.
So: Archer-spearton is more flexible, while flier-spearton is more decisive.