Looking at The Economist magazine's
Democracy Index most of the top scorers have proportional representation. From what their lower houses do:
Norway, New Zealand, Iceland, Sweden, Finland, Denmark, Switzerland, Ireland, Netherlands, (Taiwan: parallel), Uruguay, (Canada: SMD FPTP), Luxembourg, Germany, (Australia: SMD IRV), (Japan: parallel), Costa Rica, (United Kingdom: SMD FPTP), Chile, Austria, (Mauritius: Bloc vote), (France: TRS), Spain, (South Korea: parallel), (Greece: PR + majority bonus), Czechia, Estonia, Portugal, Israel, and at number 30, the US (SMD FPTP/TRS).
The champion, Norway, is at 9.81, and the only high-scoring FPTP users are Canada at 12: 8.88, the UK at 18: 8.28, and the US at 30: 7.85.
Freedom in the World the champion, Finland, at 100, Canada at 5: 98, the UK at 30: 93, and the US at 61: 83.
Ranking | Democracy Matrix the champion, Denmark, is at 0.958, the UK at 17: 0.892, Canada at 24: 0.860, and the US at 36: 0.811.
List of countries by Fragile States Index the least fragile state, Finland, is at 179: 15.1, Canada at 172: 20.1, the UK at 150: 40.6, and the US at 140: 46.6.
What's going on here?