Martial arts are great way how to train not only physical abilities but also emotional and psychological health. They can also help in self defense, so there are a lot more gaining from martial arts than from any other sports activities. If you have come to decision to train in one of them, it might be quite complicated to choose the best type of martial arts, because there are so many options.
Actually, there is no such thing as best type of martial arts. They all are good and unique in its own way, so you need to choose the one that is the most appropriate one for you. So the decision making must be made based on your own needs and wishes. As there are so many types of martial arts start with a little research about all the types and only then start the evaluation.
First you should evaluate your physical abilities and fitness level. Although all martial arts are available also for beginners, there are some types that require high level of physical fitness even at the first lessons. For example, MMA trainings are very hard and if you don’t have high physical fitness level they probably won’t be appropriate for you. For those who don’t have high fitness level Karate, Judo and Kung Fu would be more appropriate, because there the physical strength is not so important.
Then think of purposes why you train. What exactly you want to achieve? Do you want to train more your physical abilities such as strength and flexibility or emotional and philological abilities such as self-control and self-esteem or maybe you do it just to learn self-defense. For psychological trainings better choose low impact martial arts such as Baguazhang, Tai Chi, Chi Gong etc., but for physical MMA or boxing. Also for self defense boxing and other stand-up types would be better, because they are more practical in dangerous situations, but generally all martial arts are meant for self defense and can help you to fight back.
Next you should consider what kind of activities you want. There are stand up or striking and grappling martial arts. If you want to do more kicks and punches than choose one of the strike martial arts such as Kickboxing, Karate, Kung Fu etc. Stand-up styles usually are also more intense. If you want to Grapple try Wrestling, Judo, Brazilian Jiu Jitsu etc. If you want to tray all at once, choose MMA.
When you have found some martial arts that you like and fit your abilities, think also about practical aspects. For example, consider is there any place near you where to train that type of martial arts. Martial art trainings must be regular and quite often, so if the only place where to train is located far away, better choose something else. Irregular trainings wont you expected results. Consider all the practical aspects you can think of.