Ive never shot the Keltec, but I do have both the TNW Aero and a JR Carbine takedown in 9mm.
To be fair, I only have approx 4-500 rounds of various ammo out of each, 2 FTF from the Aero but I think that was mag related ( KCI Crap mag) and zero failures of any kind from the JR.
Ease of takedown and cleaning goes to the aero by a mile. Seriously JR? 2 different sized allen screws and a bloody AR wrench, what a PITA!
Aero is pretty simple, two push pins, remove the charging handle and the bbl and your done.
Fit and Finish, both are really well made so thats a tie.
Weight
JR is a tank compared to the aero, for a backpacker Id say the advantage goes to the aero.
Accuracy
JR has the edge here but not by a huge margin.
For a takedown, Im very surprised that both seem to hold zero extremely well.
I really like them both and would be hard pressed to pick just one if I had to.
So, only one thing to do really, buy one of each
