That is the thing about life, you can't have it all, but it's possible to be contented.
It's possible to have almost all too, but contentment is a virtue, especially when you don't have U wish for.
Mr A may provide for you and you may decide to live with his excesses.
Mr B may be there for U and you are not satisfied cos of his financial shortages or you become impatient with him.

What I feel is important is that you make a decision that given your current level of knowledge/wisdom after due diligence, you make the best choice. No one knows it all, and no one is immuned to mistakes.

The phrase "had I known" is designed to come at last, it can never come early.

That being said, make decisions that even if you have course to regret, you will know you actually made the best choice given your level of knowledge as at then.
My opinion though 😎