I personally only own bitcoin, but obviously there's other opinions out there. The way I see it, the goal of bitcoin is to store value, whereas the goal of other projects is to achieve some non-SoV utility (payments, smart contracts, etc). First, solving the money problem is a much bigger deal than solving utility problems. Second, as the bitcoin ecosystem evolves, I believe technological solutions will be developed on top of bitcoin for those utilities, negating the need for separate tokens.