For schools, Ruschlikon and Kilchberg are comparable. Some years Kilchberg is better and in other years, Ruschlikon comes out ahead. Both are better than Thalwil which is then better than Adliswil. Of course individual experience will vary and since picking a teacher isn't usually possible, we can really only talk about things based on statistics here.

https://pub.bista.zh.ch/de/zahlen-un...chulgemeinden/ is the official statistics for Zurich Canton and you can easily compare school districts here. The most interesting number is probably Quote: Übertritte öff. Primarschule / öff. Gymnasium (in %) which gives you the % of children who tested into the 6-year high school after 6th grade. In addition, the two numbers above this one (Quote: Übertritte öff. Sekundarschule / öff. Gymnasium ab 2. Sek and Quote: Übertritte öff. Sekundarschule / öff. Gymnasium ab 3. Sek) tell you the % students who test into the 4 year high school after spending 2 and respectively 3 years first in a middle school (Sekundarschule).

I'd check a few years of data as some of the school districts are rather small and therefore one year's data may not be representative.