User blog comment:Donotdiddlekids/Hopes And Dreams for Black Ops 3/@comment-4097128-20150408004127/@comment-24756040-20150408220519

They're both Zombies game modes, but remember that Exo Zombies will always have its own unique feel to it because of the Exo Suits. Infection more or less feels like Exo Survival with some un-dead soldiers than pure out Zombies, which Treyarch does and does well.