**Cerby**
Favorite: Guardian. Slower Assault Troopers with garbage weapons and double XP? Yes please.
Worst: Turret. The only good thing about these is when they kill the Engineer they're attached to.
**Geth**
Favorite: Pyro. Watching these guys march straight ahead through a wall of bullets, while on fire... that's some serious dedication right there.
Worst: Bomber. One carpet bombs the area, and you can decide to either take it standing, or run like a pyjak straight into The People's Elbow from the hunter coming up behind you.
**Reaper**
Favorite: Brute. Going toe to toe with one... or two... of these is arguably one of the most intense things in the game. One mistake, and you'll likely be in several pieces shortly.
Worst: If I had to pick one, it'd be the Banshee just for the broken sync-kill mechanic.
**Collector**
Favorite: Collector Trooper/Captain. Headshot dispensers. Honorable mention goes to Possessed Abomination for obvious reasons.
Worst: Scion. Watching a metric ton of grenades land at your feet from halfway across the map, you actually start to miss the shockwave Scion of ME2 days.