It’s highly complex, basically for retirement there’s
a) Boglehead 60/40 total stock/bond market (or BigERN variation: 60/30/10 Gold)
b) Duration matching of bonds according to retirement spending, and stock allocation on top of that. Problem: You’d need TIPS for that to provide inflation protection, which we don’t have in Switzerland.
c) Risk parity portfolios: www.riskparitychronicles.com, www.portfoliocharts.com
So far, I favour c) and particularly the Golden Butterfly portfolio for my first 10 years of FIRE to reduce sequence of returns risk, afterwards I’ll probably scale up to 100% stocks again.