Kopitar is better now, Hossa was though when Kopi was starting out and he was better then than Kopitar is now. I'd take Kopitar to my team right now even though we need wingers more then centres though.
Hossa is the better player at his position, but center is considered the more important position. They're both VERY strong on the puck, and i give Hossa a slight edge defensively. Kopitar is younger, Hossa has had the better career to this point.
Very close, but the question is "Who is better?" Hossa is better, but I'd rather have Kopitar because of his age.