4th pair has horrid fins on the male, female is too clamped and at a bad angle to see her form. Wouldn't touch him with a 10ft pole unless you want GENERATIONS of work.
3rd pair is the best out of the 4 form and finnage wise but the male needs work on his dorsal. I would consider breeding them.
2nd pair has excellent color and fins but the male is very dippy in the head. Perfect color but again you can't see the form of the female very well at all.
1st pair is decent but I think the male needs work on his fins and he's a little dippy in the head (although not as bad as the 2nd pair). Female looks nice however, I don't know if I would match her with such a finny male, I might choose a female with more moderate fins.
Out of those four my first pick would be #3, DISTANT second would be #1, Third would be #2, and #4 would be dead last way down the line.