My own opinion with experience from teaching both UniZh and ETHZ students is that the ETHZ has an unwarranted reputation umbrella, particularly in the life sciences. This magical reputation is indeed true in Engineering and chemistry (don't know about computer science) but should not be extended to cover the entire institution. In short yes the ETHZ does carry a worldwide reputation for excellence, BUT

I would suggest looking at long term plans, particularly career related objectives which may be more dynamic in the US.