The bats versus... the bats!
So one line is Poison/Flying, given to us in the first generation, whilst the other is Psychic/Flying given to us in the fifth generation presumably as the replacement for the Zubat line. Both found in caves throughout their regions, and both require happiness to reach their final evolutions.
Some questions you can use to help you answer (if you don't use these please give some other reasoning why you chose the choice you did):
- Which has the better design?
- Which type do you prefer?
- Which have you found most useful?
I actually quite like both lines (despite Zubat and Golbat being incredibly annoying); Crobat is super fast and has the cool design you'd expect of a bat, whilst Swoobat has the cuter design and (for me) an expected typing
(we're still waiting on that Dark/Flying bat, huh). But overall I think I prefer Woobat and Swoobat just that bit more. I think both have great designs and the species of bat that they are based on are adorable.