He's asking about Coronia, not Haihead
"How are they different?"
"Well here's a strategy Haihead utilizes but Coronia doesn't."
smh tbh fam
Coronia's hero is hot garbage unless you attack ground and hope the enemy units walk into the AoE. Because the deathball is in the air, unless you've got zorbs you probably don't have the meatshield like other heroes can have, plus she hurts friendlies, so she's pretty micro intensive to keep alive. If you're looking for heroes who tank everything and deal damage back like in Haihead, pass on her.
Haihead focuses on gimmicky stuff like suiciding diverbees, confusion, shadrays, and the megalodon shield buff. Pretty much all their units have some weird and unique quirk that can be utilized, whereas Coronia's quirk is more uniform as largely being amphibious or flying. You can out maneuver opponents this way, whereas Haihead is more hit n' explode.