I'd rather see a consistent performance throughout the year, but that's just me. Gesink does well in almost every race he enters. That makes him much more likable to a fan. I'd hate to see my favorite rider only popping up for one or two races a year.
Furthermore, you have never seen Gesink really peak, so that's a flawed statement. Jurgen is like Andy; a true peaker, if you will, whereas Gesink tries to peak at different points in the seasons. Thus, saying that Jurgen is better than Gesink on his best is not an accurate assessment. A better one would be "Jurgen works better to really peak for the Tour vis-á-vis Gesink''.
Anyway, I think Gesink is much more talented than Jurgen and this will be only his 2nd Tour. That sole fact testifies to how talented he is, he's getting better every year, and he's still only 24. Let's see what this year's Tour brings, I can't wait.