UNIT - Creature Balance + Visual Changes

Resurrection for two is somewhat ambiguous, as it reduces the overall health of the squad. Regeneration for two is powerful. Anti-magic for two is powerful. Honestly, I never took combat unicorns after the light ones appeared; their ability seems weak. Perhaps they make sense if the guild doesn't have regeneration and the hero is being developed in some kind of chaos instead of light.

It also depends on the opponent: if it's humans, mages, light elves, or anyone else with light magic, then Light Unicorns are better, but if it's demons, etc., then Combat Unicorns are better.
By the way, there's also punishing strike, stone skin, divine power, evasion, and other spells that don't always work on everyone. Even the druid casts stone skin, it also affects the unicorns.