Should Sara get the Google Home or keep her Amazon Echo? Leo says that while Google Assistant works great and that makes Home an advantage, the Amazon Echo has a very mature ecosystem with thousands of "skills" that enable it to do a ton of stuff.
Google Home will offer free phone calling anywhere in the US soon, and that could make it an even better option if Sara's looking for a home phone. Leo has both. They're very similar and do similar things. The Google Home is a tad smarter, but the Echo is better at home automation. So it really comes down to what she'll want to do with it.