In addition to all of the technical advantages, I believe that Steem is much more prosperous that other cryptocurrencies because it provides a real value - while Bitcoins are mined by powerful computers solving otherwise usefulness algorithms, Steem is mined mostly by people posting enjoyable/informative/thoughtful content and discussing with other people. It is also much more stable since you can't sell everything you have even if you wanted to. Cheers! : )