It just depends on the individual. A lot of ladies will suck your cock only because that is what YOU want. It is not necessarily what THEY want. And they are apprehensive about taking your cum in their mouth, often spitting it out, or even finishing you off by hand.
But I have had ladies suck me off who just could not get enough cock. They can deep throat with the best of men, and they love to eat jizz just as much as I do.
Overall though, I believe that men are the better cocksuckers, and I put myself squarely in the upper class. I can feel a man's reactions as I suck him off with different techniques, and I can guarantee that I can make him blow in my mouth. And when he has blown, I don't just let him go. He still has residual cum in there and he still needs a warm place to keep it while he comes down from the mountaintop. I let him cum fully with vigorous action, but then I relax and slow down, gently brushing his glans and cockhead with my tongue as he subsides. Some guys are so sensitive that they want to get the hell out of there, but most appreciate the extra time I take to tenderly LOVE their cock, and they keep it in my mouth for quite a while as I comfort them with my soft tongue. Some guys even want to cum down my throat, and I can accomodate that as well.