I can only answer this question according to my personal situation, but maybe it will apply to others as well. I have a son from a previous relationship who lives with me half of the time. My son means the world to me, and I would worry that it would be hard on him to have another child live with us 100% of the time when I can only have him 50% of the time.
I also wonder about the biological father, is he going to decide he suddenly wants to be a father as soon as his child is going to live in another country?
In my opinion, women who have children will have an easier time making a match with men who do not, and vise versa.
I would want to have more children with the right woman, but I think that it is easier for children to accept a new baby than to accept a step sibling.
I also think it would be easier for a woman to accept my son if she does not already have children of her own. If we decided to have a baby in the future, I think it would bring them closer as my son would be a biological brother to her child.
For the ladies who do have children already, do not despair! There are many lonely men who wish they had a family to care for, I am sure someone will find you