I have no experience with either as I have a Teraflex Longarm. Had it on my TJ and served me well. However, both of the aforementioned kits are very nice. You would likely be satisfied with either. I nearly went with the Poly because of the praise it gets on this site. It also is bolt on and it is adjustable without having to remove the arm to adjust the joint. Great selling point in my opinion. However it is a pricey kit and that is why elected to go its old faithful. Once dialed in correctly overall performance of either will likely satisfy your needs. Best of luck. I am sure others will tune in to this thread.
I also have the TF long arm, which has been outstanding. Whichever kit you choose going long arm is a wise move. I did not expect how much more stable and capable the rig would be with this upgrade. Had I known I'd have installed one from the start. You do get what you pay for.
Would add that some friends did a Poly LA kit and rave about it. Meanwhile one of our club members is likewise bullish re his RK long arm. The common barrier is simply the time and skill needed to cut off the stock brackets, prep the frame and install the new ones, weld on or bolt on. After that the setup is fairly straight forward.
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'09 JKRU. 4" Teraflex long arm, Teraflex R44 housing, Teraflex / Fox Resis, Poly Performance skids, Nemesis Billy Rockers, Nemesis flares, 37" ATZ P3s on 17" 5x5.5" Trailready HDs, Spyntec hubs, Teraflex BBK, Mopar BBK master/booster, Superior front & Alloy USA rear axle shafts, CTMs, Reids, Synergy drag link & tie rod, WTOR hydro-boosted steering, 5.38s, TF Dual Rate front bar, TF bumpers, Warn Powerplant, Tom Woods shafts, AA xfer case cable, Kilby canister relo, RH4x4 cage.