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I think it depends on what type of keys you have and how often you need to access them. If you relatively small keys and have keyless remote/entry for your car and a garage opener in your car, you basically never have to take your keys out, which makes the cles a good option. If you a lot of keys and need quick access to them multiple times a day, the 6 key seems like a better choice.
This is how my keys are. i never use them and have keyless entry and garage opener.