1) The only deal breaker will be if you try to dress up a strength as a weakness (eg go down the “perfectionist” route). I’d really isn’t about what you choose, it’s more about how you frame that you are purposely addressing it as a development area and finding ways to push yourself to get better in that area.
2) either approach is fine, but defining how you have classified competitors and how you ah e approached the question is a good thing to include in your answer