I prefer bibs for all the reasons above.
I have never experienced chaffing from the straps, or any other part of any bibs I own.
When I started riding I had a pair of short, but waist band cutting into my abdomen, made my try bibs.
My advice, like others, is to buy a pair, with a chamois you know and like, and see if they're for you.
But remember, we told you so, and what are you going to do with all those uncomfortable shorts?
Pirk