Its not all about stats. If it was, Nnamdi would be one of the worst CBs in the league, which he is not. As you also say, they did not even play same position, which is another reason not to actually compare stats. Furthermore, Reed player two more years in college than Berry.
Berry is freakishly athletic, and imo as dangerous when he has the ball in his hands. He is a great open-field tackler and he plays the run really well. I cant think of anything Ed Reed, Polamalu or Taylor could do which Berry cant.
Eric Berry played 3 years.
If your going to post stats.
Post them correctly and yes i can compare them because Berry was nowhere near the level Ed Reed was in college.