small enough to where it doesn't matter
Either one has their place and time.
yes to underwire
depends on size of breasts and top/blouse. My wife has large breasts (36DD) and benefits from the support, large cleavage with underbra to help her show off with low cut tops
I'd prefer a no underwire, pushup bra and I need a 44AA. I've never seen one of those!
Underwire! Helps to define the breast.