What's the most abstract difference between Bitcoin and Ethereum in two sentences?

Bitcoin is something with a lot of complex descriptions to it that you cannot easily grasp at the beginning, but when broken down, can be synthesised into something beautifully simple when it comes to describing what it is and how it functions.

Ethereum is something with a lot of simple descriptions that can be quite easy for you to get onboard with, but when broken down, rises more questions than answers, gets more complicated with every layer of questioning, and elicits in you a sense of dread that something like this is actually being attempted at such a scale by so many people with so much money literally at stake.