Cap all the way. Clark has powers out the ass. So he never really has to work for anything he accomplishes and the only things that can even really cause him harm are Kryptonite (which he is now apparently immune to) Magic (which he is apparently totally able to overcome with next to no effort at all) and other kryptonian level beings (Which he seems to always be able to out easily overpower or out lucked by never being forced to face them). Hell he can even defeat death by simply choosing to live instead.
Cap on the other hand, while he does have powers his only allow him to be the peak of humanity. He still has to put forth great effort in his battles. Yet, he never waivers in his resolve for the fight. He has lost so much and still fights and, these aren't things he never had. He lost his entire world too but, he actually knew the world he lost. He had to consciously make the decision to give it up. Thats quite abit different from being told after your 18 or whatever that the only home and world you've ever know was not yours and a world that was never even a part of your life was totally destroyed long before you even knew it existed.
Cap has much less and still sacrificed much more and would continue to do so with or without ANY power. Much less nearly absolute power.
Cap 100000000000000000000000000000000000000000000/10