Here's what I see about which variant is strong and weak. (It may be my opinion when I play the classes skillfully)
Strong variants for Plants:
- Iron Citron
- Druid Rose
- BBQ Corn
- Toxic Pea
- Armor Chomper
- Vampire Flower
- Camo Cactus
Strong variants for Zombies:
- Z7 Imp
- Electro Brainz
- Captain Sharkface
- Camo Ranger
- Roadie Z
- Marine Biologist
- Tennis Star
Weak variants for Plants:
- (can't really think which Citron is weak)
- Frost Rose
- (can't really think which Corn is weak)
- Commando Pea
- Chomp Thing
- (can't really think which Sunflower is weak)
- Bandit Cactus
Weak variants for Zombies:
- (can't really think which Imp is weak)
- (can't really think which Super Brainz is weak)
- Captain Cannon
- Super Commando
- Landscaper
- (can't really think which Scientist is weak)
- Rugby Star
