Ethereum has taken what was a four-function calculator of a programming language in Bitcoin and turned it into a full-fledged computer.

There is nothing that Bitcoin can do which Ethereum can't. While Ethereum is less battle-tested, it is moving faster, has better leadership, and has more developer mindshare.

Ethereum will be a first-class citizen on Coinbase.

The scripting language in Bitcoin is important because it is what makes Bitcoin 'programmable money'. Within each Bitcoin transaction is the ability to write a little program.

When the Bitcoin white paper emerged in 2008, it was completely revolutionary. The amount of concepts that had to come together in just the right way - computer science, cryptography, and economic incentives - was astonishing.

Make no mistake - Ethereum would never have existed without Bitcoin as a forerunner. That said, I think Ethereum is ahead of Bitcoin in many ways and represents the bleeding edge of digital currency.