The resilience/tenacious doesn't waste cutting edge, sadly the Recon 1 does. But it's superb lock, better steel and locked in grip make it a much better works knife.
I have both and have used the Resilience as THE travel knife for all foreign trips, overnight travels etc for the 8 years I have owned it because it holds an edge, has done everything I have asked of it, from cooking to wood splitting, slides comfortably flat into pocket and doesn't look aggressive or threatening despite its size.
It looks like a folding kitchen knife which is what I tell inquiring parties.
A couple of years ago, I took a new aus 8 Recon 1 as the travel knife on a fortnight's trip around Turkey. I regretted it. Not because of performance but because of appearance. It just looked so damned murderous! It rode on me everyday (there was a spate of bombings at the time) and at one point I had to give it to the soldiers guarding the tomb of St Nicholas.
They were wanding everybody so I pre-empted the search by informing the tour guide and handing the knife and my SAK into the security booth.
The soldiers were cool, very cool. Wish my Turkish was better as one was very very lovely and seemed very impressed by the knife and my manliness. Lads, that girl was beautiful.
The tour guide was the only one with an issue and strangely it was about the SAK?!?
Women are weird the world over!
This incident though really made me aware of how aggressive that knife looked and I have stuck with the Resilience ever since. It also does food duties better in my opinion, I prefer the opening hole to studs and is more than enough knife.
I still use the Recon for camping and I could kick myself for letting the CTS XHP model slip through my fingers as I have a Holdout II in that steel and it's a fine, fine thing.
I may take that instead of the Resilience on the next trip to see what I think.
Ultimately they are both very good knives. Ones construction is much more massive than the other but its appearance is far more militaristic.
I don't think with either will you feel under knifed.