Don’t get one if you ever intend to travel together and don’t have parents/close friends to leave them with. Cats are amazing but after they develop their little neuroticisms, you’ll never feel comfortable leaving them with strangers.
If you live in a house in anything but the most remote places, keep them locked up otherwise they’ll go missing one day and it’ll break your heart.
Other than that there’s not much that can go wrong, just pick the one you vibe more with and that’s it.