In terms of fin quality, I agree with DM17 - the light colored male is better. They are more symmetrical and .... neat (?) while the copper shows signs of rose - something you don't want to breed.
You need to make the light colored fins a bit thicker by pairing him to a firm finned female.
Edit - originally posted:
If you want to be 100% sure, get a female with a 180* spread, with 11 base and 4 end ray branching
and preferably with pointed tail edges.
I meant to say 8 rays ..... sorry about that.