I'd be surprised if a modern belt went ping after 9 years when many manufacturers have 10 year intervals.
The Ford Fusion of elderliness was 11 when I bought it, still on then original belt (10 year intervals). A Gates belt kit and Ford water pump were under a hundred quid, and the job took me 2.5hrs. The hardest part was refitting the stupid Ford stretch belt on the alternator as I don't have the correct tool, but I managed.
Belts are relatively cheap and easy to replace, and it's rare that a belt in interval fails. Chains are intended to be lifetime items, but all too often they simply aren't, and on certain models (BMW diesels of a certain engine code) it's almost guaranteed that they aren't, but changing a chain is painfully difficult and often very expensive, as many of these engines were never designed to be removed during the life lf the car - after all, chains never fail, so why would they need to?
Give me a belt any time - all you need to do is look after it every 8-10 years, which isn't a hardship, and is a small price to pay to avoid the massive expense of chain gear problems.