I don't see whats the big deal of having a timing belt is
but anyhow, timing chain engines tend to be a bit noisier due to the gears that drive the chain.. and they're more complex which means if there's any problem with the engine and has to be torn down, there's more labor involved
timing belt engines are quieter, and allows for easier work on the engine.... especially if you plan on making modifications to it... it's easy to change cams and "adjust" the timing on them if you have a timing belt... on a chain its not so easy