RE: timing belt vs timing chain, to each of their merit: they both have strengths and weaknesses.
T-belt: silent operation, timing doesn't shift as the mileage creeps up, etc. been used in mass-production autombiles since the late 60s.
You must, however, be diligent with the T-belt replacement interval. Otherwise: if t-belt shreds/snaps, you are pretty much done for (interference engine)
chain: older technology, been used for a long, long time, widely accepted.
bad: chain stretches over time and becomes noisy, causing timing shifts. Poorly designed engines (e.g. Xtera 4cyl type), the chain is a major, if not frequent trouble.
Servicing cost can be high, for you need to replace all the sprockets, etc. along with a new chain and chain rails, guides, tensioners, etc.
I've used both and see no such thing called "one superior than the other". Both have their strengths and faults.
T-belt servicing, alongside with tensioners, water pumps, etc. must be included as part of the automobile ownership scheduled maintenance scheme, which most avg joes don't seem to understand nowadays.
Lastly: chain can also snap and fail also.
Q.