I know my answer might be controversial, but I take an analytical approach when answering these types of questions. Using quantitative measures, I think Tron clearly has the best community. I understand that all these metrics can be gamed, but I believe that looking at these measures is the only way to quantify the qualification “best”.
According to data aggregation service CoinGecko, Tron has the most Facebook likes out of any coin tracked. Furthermore, Tron has fifth highest amount of telegram users in their sponsored channel and the sixth largest amount of Twitter followers. Tron is clearly popular across social media platforms, and many retail traders and potential dapp users are interested in using the Tron platform. These people who are early fans of Tron are a key component of their community.
Tron also has a significant amount of users actually using dapps on their platform according to DappRadar. In fact, more people use TRONbet, the most popular dapp on Tron, than IDEX, which is the most popular dapp on Ethereum. Their early users differentiates Tron from many cryptoasset projects, and displays a genuine interest in utilizing the platform.
Tron is also following Ethereum’s path (DevCon) in hosting incredibly large conferences for their community members. In fact, the niTROn summit will have Kobe Bryant speaking. While Kobe Bryant might not be an expert on cryptoassets, he will definitely generate buzz about the event and excite the Tron community.
Unlike many cryptoasset projects, Tron constantly communicates their progress to their community. Tron has a weekly report that they publish on their website, which allows their community to understand the development of the project. Furthermore, they make sure to publish announcements about coin listings and partnerships that are of interest to speculators and investors.
Finally, Tron has had the fourth most GitHub commits from developers in their community in the past twelve months. GitHub commits is one metric that can be used to measure contributions from community developers.
While Tron has received harsh criticism for Justin Sun’s marketing techniques and their desire to “move fast and break things” (ex. their white paper having some passages seemingly copied from Filecoin’s white paper), looking at quantitative measures Tron has the best community.