Bitcoin was very valuable because of its advanced and precious technology called Blockchain.
Well to be honest dude, there are some altcoins that are much more good and better than Bitcoin just like Ethereum.
But since Bitcoin was established the big community in the entire world, now wonder why lot of investors embraced it maybe
because of its unique features it has that's all what I had noticed.
To be honest also, Ethereum has the ability to be sided with bitcoin but Ethereum is way far to bitcoin when calculating the gap. You didn't noticed the blockchain itself in bitcoin that's why it's the greatest and leading cryptocurrency of all. Ethereum is like bitcoin but with when talking about features and platform who adopted cryptocurrency, bitcoin is the best.