Some are good, some are bad, like with any breed, in my opinion. I've had a few extremely skittish and weak Polish cockerels that were pretty useless. The hens just drove them off and there was no mating. But I've had good ones, too. Observation is the best way to inform yourself on which one to...
Need better pictures of backs including shoulders, crests/combs, and a side view including tails. And that still might not help as Polish can be tough.