Kickboxing is nothing more then a stripped down version of karate, they pretty much removed a the grappling aspects and called it kickboxing
the one with the better instructor is subjective
its like a high school teacher ,the ones u like are the ones your
friends came to dislike but theyre both getting their message across
so the better instructor theory is out the window
kickboxing is sport oriented where as karate has traditional values
associated with it along with a meditation aspect to it
Whichever style has a better school in your area and price range. Both can be great or terrible depending on the teacher and the student. Go to the schools around your area and try and find one that you feel like you fit well in. Also you want it to have a lot of drilling and sparring, if it doesn't have those then don't bother with it. The only way to learn to fight is to fight and sparring does that in a controlled environment that lets you understand what you need to work on and why usually.
For mental improvement I would go with karate, it teaches discipline as well as conditions you. Make sure you go to an actual karate instructor not a program to get a black belt in 3 months. I see kick boxing as more of a workout
100% kickboxing.
You can be fat and be "good at karate", it doesn't train you as hard as kickboxing, it feels like a joke.
Better for what?
