The difference is 21%.
3.08 is physically stronger than 3.73 or any higher number.
My Bronco runs 3.08 + 32s, and I can tow the world, but my trans has one of the lowest granny gears ever offered in a 1/2-ton truck. It's perfect for me, though, because I don't have OD, but the high gears make up for it. I can set the cruise over 100mph & turn less than 3400RPM. I've never topped it out.