To keep it simple, Bitcoin was the first ever cryptocurrency that was created and dates its origin back to 2009. Backed by blockchain technology, it is very easy to use compared to other forms of online payment processors like PayPal and Skrill. Even better, just holding onto Bitcoins yields profit in the longer run with its continuous growth. These are just a few reasons for anyone to choose Bitcoin and this is nowhere near to the end of its strengths.
Because there is nothing better, there are other crypto that are very good but bitcoin is the oldest and the one that is the most trusted among the community and when we take in to account the economic aspect things get even better, bitcoin is the coin that has given the best earnings and there is not a reason to think that is going to change in the future.