JT for sure - without a doubt.
1. JT
2. Cronk
3. Pearce along with Hornby
You seriously can't rate Pearce highly because of his minute impact within the Roosters. Sure his defence is outstanding at origin level, but his contribution to the roosters is incomparable to JT's work for the cowboys. JT for the win.
JT is the better halfback, BUT you need to understand that Pearce is only 22 n his only on the rise, so for now yes it is JT but in another 3 years no doubt in my mind its gona be Pearce.
cronk, JT just looks especially good because he carries his team, whereas Cronk actually has other good players on his team (Smith, Slater etc.) that in a sense kinda overshadow his abilities.