RM, also known as RapMonster and RapMon, has a successful rap career even outside BTS. Before even joining the band, he gained notoriety as a talented rapper.  Moreover, RM was the first member of BTS to go solo and has released two albums of his own, the latter of which reached #26 on the US Billboard 200 chart. This widespread success confirms RM's talent, confirming his status as the best BTS boy.
Although RM's rap success is admirable, this skill does not necessarily mean that he is the best BTS member. In order to win this title, a member must be a fan favorite, first and foremost. RM's rap success does not speak to his popularity with the band's actual fanbase. W It's clear that RM is the best BTS member because of his successful rap career.