My entire business career people told me I must have very large balls. When in fact, physically they aren't so big. I would say more on the smaller side if I had to guess. I never stood around in a room of of naked men and compared.
Having smaller testicles did not mean I was less of a man and I would say my business success would rank in the top 5% of all men and income in the top 1%. From a sexuality standpoint, it never once has slowed down or inhibited my ability to have sexual relations with beautiful women. Never once had a woman say, "Wow, look how small those testicles are." My wife prefers them smaller too.
I could care less how big mine are. The older you get the more they hang or sag, depending on your body composition, and I really don't want to have them bobbing in the water when I am sitting on the toilet.
That's just my opinion. If having large testicles is important to you and you feel like it gives you confidence and swagger, then I say go for it. But if you are going to make them big, then I'd make them real big. Don't go for a "B" cup, go for "DD's" and get your moneys worth.
Maybe if we were still Neanderthals walking around naked I would want testicles the size of grapefruits, but, that is not the case.