My understanding is that chains are a bit more expensive than belts and a bit noisier. Personally, I’d prefer a chain because changing a belt on a transversely mounted motor (modern FWD cars) is a PITA if you do it yourself, and expensive if you have it done. For cars with interference engines, I think belts are a fairly dumb idea – especially if the water pump is driven from the timing belt. We had a water pump seize up at 40K miles 500 miles from home on one of our cars. Broke the timing belt of course. Fortunately a non-interference engine.
As a result, I consider an interference engine with a timing belt driven water pump to be a bed enough idea that I won’t buy a car built that way.