I wouldn't so sure about that.
I mean everybody lives the life they want, I have absolutely no problem with that. Some gay or lesbian couples will make better parents then some hetero couples, yes.

My question is: Can the best possible homosexual parents have the same "potential" for the child as the best possible heterosexual parents?

My answer is: I don't know.

The thing is our society, and humanity, is based on men and women. Men and women have physical, emotional, psychological differences that give humanity it's balance. Therefore I'm not sure a child raised by homosexual parents as a chance of being prepared to face the world and society in the most appropriate way since at least a small part of references will be missing in it's education.
It's just a domain in which we have no experience or reliable statistics.
But then if we never try we'll never know...
Another complexe matter to me.

Cool debate.

Ponrauil