Other competitors such as NEO, EOS, Waves, and IOST have very promising features and technology too. However, it is up to question whenever they will become successful in the mainstream world or not. AFAIK, EOS and Cardano have better chances of rivaling Ethereum than other platforms due to their dedicated development teams and strong foundation. NEO, on the other hand, is good but backed by China which poses a risk for centralization and manipulation. EOS is partly centralized, although it could change over time as it improves every step of the way.