When you cannot breastfeed your child, do you prefer give him formula milk or find a breastmilk donor?

I am not trying to judge, however I will avoid giving my baby donated breastmilk as I do not know how is the donor's diets (consume coffee)? is the donor a smoker? is it free from diseases? Is the donor practice highest hygiene level while handling her milk? Is it really safe?  In Singapore, there is no breastmilk bank yet and mother can donated milk from donors offered in online forum. Unlike in USA, breastmilk bank such as OhioHealth Mothers’ Milk Bank has screened through all the donors' profile and health issues before banking. Thus, I will recommend you to feed formula milk to reduce the risks that I have mentioned above.