I read many cappers, but I would tend to agree if push came to shove, I would go to TN first. My opinion is based on the following reasons:
1) That awesome name. By far the best nickname on any forum I've seen
2) He's consistent and hangs around through stick and thin
3) I think he's the best at answering back to posters who asks questions of him (no arrogance here at all).
To me, its not only winning % (which is very important), but there are many good cappers at this site.
The great thing about being a newbie (like me) at a site is that it is usually easier to tell who are the really nice people, and who are the assholes (those are the ones who automatically think that they are better than you because they have more posts on a public forum).
There is another forum which I belong to where I have been around for a while, and while there are many really good cappers, I personally give more creedence to the ones who answer questions (which is how EVERYBODY to some extent learns handicapping).
Hope that helps.
BTW, TN seems like one of the better people on this site all around. (% and attitude!)