as I think people can see there's no such thing as one-size fits all.
the same can be said for where you are in the country. Rental yields (the ratio of rent to capital value)in London are usually around 4-7% in benign interest rate periods, where as they can be a a fair bit lower than that in the sticks.
In theory I could analyse any 5 (or 2 or 10) year period over the last 25 years and show that Interest Only mortgage, Amortising mortgage, Endowment mortgage, Self-invested capital repayment mortgage, Renting or living under the arches is a superior economic choice for that period.
The relationships between all the components in the relevant calculations are not constant ratios over time (or location) and vary according to the whims of the various asset markets, inflationary environment and treasury base rates.
Its a pity more people dont get taught/make an effort to learn about such things to help them make better decisions.