I know I don't own a JK, but I'll chime in here.
Traction control may be great for on pavement...I know the traction/stability control works great on my WK on the road when things get slick. But if you're off road and want to disable the traction/stability control to allow for some wheelspin (in mud for example), then the vehicle will function exactly like one with an open differential...the torque will take the path of least resistance and one wheel per axle will spin like mad while the other just sits there.
So yeah, go for the traction-lok. Traction/stability control will help on the road, but it won't be effective off road if you disable it using the button on the dash.
2012 Wrangler Rubicon 2-door
2009 Aprilia Dorsoduro 750
2008 MV Agusta Brutale 910S