The advantage is that bibs are simply more comfortable than shorts. So much so that I gave away all, save one pair, of my shorts since switching to bibs. My suggestion on sizing is go to an LBS and try on some different brands prior to buying. Many euro bib mfgs. size their bibs on height rather than waist size.

There are tons of great choices in bibs ranging from Assos, Santini, to Pearl Izumi. Suggest you not buy cheapo China made on scambay or used bibs.

Yes, the nature break can be an issue with bibs but it does not seem to bother most pro riders who wear bibs.