Here's what I know:
Crawler- Good to start with, it can kill swordsman at the beginning of the game, but needs micro and takes time. Stronger in packs, but it is required to remove them or let them die later because it takes 1 population for each one and it won't be useful later.
Bomber- Good to start with, it is effective in short maps if you are going to ruin their economy, but you will need to protect them to use them. Good to support your army by damaging multiple enemy in massive battle, sometimes it causes your enemy to retreat.
Juggerknight- Tank damage, stun enemy with charge, all great, but weak against giant and magikill.
Dead- Poisoning enemy, tank damage, but it hits only front, so you can't poison healthless enemy behind like magikill, archers. In packs, it can be very strong, but their worst enemy would be magikill.
Eclipsor- Faster and slightly cheaper,but weaker than albowtross. It is strong if you mass them, it can be impossible to kill.
Marrowkai- It can kill giant and magikill easily with reapers and hellfist. Good to use in massive battle.
Medusa- It can kill giant and magikill easily, you can even poison enemy with venom flux when they deside to attack medusa with many units, but it is weak against shadowrath.
Giant- It takes so much damage to kill them because of the patch, this giant's attack is not very useful or anything, but great to tank damage.
actually for crawler, its to take the tower and attack the swords.
If you make crawler only thought, even without rage, the swords will overpower you if the opponent is strongly offensive(like me)
For bomber, its only to make the swordsman die and kill miners. (you might not be able to hit all swords( or maybe even 1),but you are giving him a REALLY HARD TIME
oh, wingadons are better than albowtross
