We rent out of choice. I.e. we have enough invested that could cover a deposit, sdlt, fees, and the like. We also don't know if we'll stay in London forever.
We live centrally which means we'd only afford a flat, which suits us fine. Flats in London however, are down massively in value.
AIBU to think people are naive when they ask "do you own or rent" as if owning a 10% slice of a house is obviously much better and more successful than someone who rents. Most of the time people are trying to measure up how rich you are.