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Salmance vs Crobat
Crobat has higher speed,defense, and special defense, and HP
Salmance has higher attack, special attack.
Crobat is weak to: Electric, ice, Psychic, and rock.
Salmance is weak to: Ice, Dragon, and Rock.
Crobat is resistant to: Bug, Fighting, Grass, and poison
Salmance is resistant to: Grass, Bug, Fighting, Fire, Water.
Appearently, if you look back, Crobat may be best. It has higher stats, even though it is weak to more types. So, I think the decision is: