I’d prefer ranked ballots, so that every MP is elected by at least 50% of the voters in any riding. Yes, that means that up to 49.9% of voters in any riding may not feel represented, but it’s still an improvement, and keeps us away from splintering the legislature into a half dozen cells.
For me, I tend to work backwards.
Look at those countries whose quality of life I admire most, and who have objectively comparable or better outcomes for society (poverty, income inequality, health, lifespan, crime etc.) then ask, what are they doing different?
A cursory examination of countries using one set of statistics (UN Human Development index) and one anecdotal (the happiness survey) comes up w/most similar names.
Norway, Switzerland, Sweden, Denmark, Finland (all PR systems); while a larger list features New Zealand as well.
HK and Singapore show up in these lists, though both have some democratic deficiencies.
Only 2 countries that are fully democratic and don't have PR are top 10. Canada and Australia.
On balance, that leans me towards some variant of unicameral PR, w/provisos for minimizing extremism and ensuring some stability. (ie. 5% threshold to get PR seats)
I recognize some of things I and others might value aren't direct consequences of the electoral system, at least in all cases.
Though, I think there is a tangible link between a society that values diverse opinions in its legislature and power-sharing and social-economic framework that likewise emphasizes some sharing
of the spoils of a society's wealth and minimum standard of living for all.
As opposed to an electoral system framed as winner-takes-all; which would seem associated with a similar socioeconomic mindset.