Easily comparable by using price as a basis when comparing bitcoin to other cryptocurrencies. Also do note that bitcoin is the first ever "decentralized cyptocurrency" and was made last 2009 by Satoshi Nakamoto. Bitcoin's existence has evolved and influenced other cryptocurrencies as well and this is the reason on why many of it are starting to develop by this year. Lastly, bitcoin's influence has a scope of around the world and the number of users are increasing per day due to its volatility that can yield profit by short amount of time compared to any other investments.