There are more than enough reasons why OP should choose Bitcoin over every other existing Cryptocurrencies. You mentioned quite a lot already. Even If Bitcoin is not been used and accepted as an official currency in almost all countries, There's still a possibility that It will someday, If not anytime soon.
Bitcoin is not yet popular in many countries and we cannot use it to buy anything at physical stores but things will change in future when bitcoin will become more popular and will be used as a normal currency and till then I am treating it as an investment which can give me best returns in future.