The third one looks like it will get a lot of pearls, and be a very chunky fish. You never know though. They are all very nice. But if it were me, I'd get the third.
#1 has the biggest kok and really nice colours but... I would say he has the best kok and worst colours
#2 has what looks to he a small kok which is also the smallest. But really nice vibrant bright red and black colours plus nice pearls. He has the smallest kok but best colours
#3 is in between. His kok is in the middle but looks to be a water kok and definitely potential to get quite big, plus I like his colours and pearls. His colours are in the middle of the 2.
All are zz based...IMO. The last two have more kamfa look...my guess would be zzkamfa. I would go for the last one...he has more pearls on the head and face.