Caddyman is correct. And for MOST people who only keep their vehicles 150-200k miles then a timing chain is probably a cheaper option.
But for those of us who tend to keep their vehicles 300k+ miles…Timing belts are cheaper…Especially if you can change the belt yourself. While timing chains do last a lot longer then timing belts…over time a timing chain will eventually stretch. And with an interference engine…a stretched chain can jump a tooth…and cause internal engine damage. Luckily timing chains usually start to make noise before they get to the point where they’ll jump a tooth. So you can get it replaced then or get rid of the vehicle. If you want to replace the chain…expect to pay 4-5 times the cost of a timing belt. Parts are much more expensive but labor is really the killer (there’s a lot more work involved).
I would LOVE to see timing chains with NON-Interference engines. But with an interference engine I like a belt. For me it’s a much cheaper option.