Every day new projects are entering the market and trying to get their space.Only if their propositions creating value for someone can make them retain but still this does not necessarily means creating a long term value for anyone.If we want to address a crypto that is not bitcoin but also still does not need a definition if it is some kind of fiat money or paying card, because even these services existed already today we need to address exactly this definition.It is a lot easier to use projects like IOTA instead of Bitcoin.A library will be much smaller with those project and the network will not require some high computational power on the side of the clients.Also realtime micro payments would be in one specific use case worth to take a look at them.But if someone would have the impression that IOTA is the one and only best crypto, we cannot confirm this.The final answer requires the propose of the use case and the context in which bitcoin, IOTA etc. are used.