Why should I use NEM when there is Bitcoin?
Bitcoin is purely a crypto currency, like many other digital coins. Some are application specific while some are purely currencies.
Apart from NEM being another crypto currency, NEM is a solution platform, there is more to offer as a platform.
As a crypto currency, it does not require a lot of computing power and energy to run a node.
NEM also advocates low entry barrier with Proof of Importance (POI) instead of the traditional ones that require a lot of stakes or computing power to mine. In NEM we call it harvesting. In addition, it also uses another solution, called Eigentrust ++ to validate and sieve out bad actors in the network.
As an evolving solution, NEM is setting the stage for better things to come.