JBud, is right on the money with this one. It really depends on your hunting style. The J34 is suited for multiple days in the backcountry with the ability to comfortably carry out a heavy load of meat. The X2 is no slouch either with its beefy internal frame, but it lacks the fine-tuning adjustable suspension that the J34 has. The X2 is a one size fits all style. The X2 can haul a heavy load without pack failure but it will not be as comfortable as the J34.
I have had the x2 and have the j34 right now. I got the 34 because the x2 wasn't big enough to keep all my gear inside for backcountry camping. I would say if your just doing day hunts the x2 is the way to go, but if your going a few miles back and camping I'd go with the j34, it's awesome because you can collapse it into a day pack. And the scabbard is awesome.