J-Hope is the best member of BTS because he excels as a singer, rapper, and dancer, the three main categories into which K-pop idols fall. Many members of K-Pop groups only fall into one or maybe two of these categories, which demonstrates how impressive it is that he can do all three.
J-Hope may not be one of the main singers in BTS, but his skill in singing cannot be discounted just because of this. His singing, including his use of a blend of rap-singing, appears in many of the group's songs, such as "Rain" and "I Like It."
J-Hope's rapping skills are encapsulated not only by his status as lead rapper in BTS but also by his international success as a solo rap artist.
During his tenure as a trainee at Big Hit Entertainment, J-Hope appeared alongside established idol Jo Kwon in the latter's track entitled "Animal."
After his BTS debut, J-Hope released a solo album entitled HopeWorld, which peaked at #38 on the Billboard 200 chart, making him the highest charting Korean solo artist for the time.
Additionally, his single "Chicken Noodle Soup," which features Becky G, reached #3 on Billboard's Digital Rap Sales chart, which is the highest of any solo male K-Pop artist.
J-Hope's exceptional rap skills have therefore allowed him to become successful in every stage of his K-Pop career so far.
J-Hope is a highly skilled dancer. He trained for about seven years at a dance academy before even joining BTS's agency.
J-Hope was also a competitive dancer and even won a national dance competition in 2008.
Within BTS, he acts as a leader during rehearsals, helping his fellow members learn choreography.
J-Hope's choreography has even inspired a viral dancing challenge on Twitter.
The fact that no other BTS member has accomplished most of these achievements marks J-Hope as the best dancer in the group.