Talk:Creeper/@comment-75.82.137.125-20121014193114/@comment-75.192.3.170-20121016121947

Mainly cost I think, and rank. Other than that its a gamble on what you get, but certain units have a higher chance of becoming certain units.

Such as sniper units having a better chance at becoming a stalker, I think a peacekeeper can become a cannoneer, chemical grenaider becoming a bullfrog or a cannoneer.