The thing about underwired bras is the wires can have very different profiles. Some brands use a wide, shallow shape, others narrow and upright, if you can picture that. The wires should lie at the “corner” where breast meets chest. Known as the “root of breast”. On a lingerie course we all mapped our own with wire and when we compared them the differences were astonishing!
The “shape” you are has little to do with the size of your breasts a narrow rooted Acup can become an FF and it would still have the same shaped root. If you wear too wide a cup it will send you east-west no matter how big or small you are.
I wore non-wired bras exclusively for 10 years till Victoria’s Secret sent me a wired bra in error and it fitted like a dream!
All bra brands choose a shape and when you find one that suits you, stick to it.
There are some great brands recommended here but if they don’t fit your profile, you won’t find them very comfortable or supportive. The only thing to do is try them on. And keep trying till you find your perfect fit.