No system of legitimate Martial Art is inherently better than another (unless it is a real system verses one of the fraudulent schools). How strong a system of self defense can be is completely dependant on the person training in it, and the quality of instruction.
Keep in mind that some schools are more focused on "sport" while others are more reality based for practical self defense application.
There are TKD schools that are more traditional and focus on more balanced training, but you need to ask, and it is probably best to watch the advanced students and Black Belts in action. Taekwondo traditionally places a greater emphasis on kicking as a primary weapon due to the strength, power, and reach of the legs, however the hand strikes, elbow and knee strikes are just as effective in Taekwondo. Also, a complete Taekwondo curriculum includes pressure points, joint manipulation, joint locks, grappling and close quarter fighting, and ground-fighting tactics.
Most systems of Karate are very similar to Taekwondo, but place an emphasis on hand strikes instead of kicks. Also, the methods of generating power in blocks and punches differs between Karate and Taekwondo, but both systems are very powerful, and potentially dangerous.
Kwon means to "strike back or break with fist" in korean. The original founder of Taekwondo studied Taek Kyon and karate. Over time other masters have expanded the style and added absorbed bits of multiple styles. I don't think there is a 'kwon' that is the root of Tae Kwon Do
Their are different style's of Karate with Different good or Bad points 'Shodokan is lower and is more solid, Gojo is more upright and better flow, also different instructor's with different perspectives and levels of experience and ability to pass on that experience as is the same for Tai Kwon Do, Basically Tai Kwon Do has better jumping/ spinning Kicks where as Karate is generally more grounded and has more punches/strikes with lower solid kicks.
Tae kwon do is the Korean version of karate. Neither is 'better' than the other. It will also depend upon what the student is looking for. Visit both dojo and see what you like and don't like about what you see.
I believe it is based on nin-jutsu although there are a few hints of tae-kwon-do and karate
There is no one original instructor. Karate was created by many instructors in the 1800s in Okinawa. It developed further after learning from china, mainly fuchou - Taiwan. Then became karate. There are many groups or types, for example, in the 1800s there was nahate, tomarite and shurite. Nahate was created by kanryo higaonna and later into gojuryu by chosen miyagi and many splinter groups in japan and Okinawa. Japan and Okinawa does it differently. Karate means empty hand in Japanese. Tang soo do and tae Kwon do is Korean and it is not karate. They used more feet than hand.
Karate.
karate and judo
Tai Kwon Do was created through a combination of Karate and the traditional arts of Korea. The Japanese banned the practice of these arts during their occupation. Numerous Koreans learned some of the martial arts of their conquerors and leater combined them keeping the best parts.
In my experience, I found Tae Kwon Do to be a more advanced and proper martial art than Karate.
Karate, tae kwon do
tae kwon do it is like karate but different
All over the place. A quick search on 'karate' and 'Minneapolis' brought up over a dozen schools teaching karate and tai kwon do.