I don't know how you shop for silencer (online, local dealer, etc.), but before I'd buy the Aviator 2 I'd shop around.
I've seen the Element 2 (and Sparrow) at quite a savings online - apparently it's / they're "old news" (but still some of, if not the best 22 silencers I've seen / heard), so it seems some are now running them on sale.
If you shop wisely, and have a little luck, you may be able to swing an Element 2 for not much more than an Aviator?
Money's money, but when I bought I decided as much trouble / time / expense as silencers are (thanks to Uncle Sam), I was going to get one of the best that could handle anything I could see myself throwing at it down the road.
BTW - when I bought my first 22 silencers, I ran across the video (I think it was done by Silencerco) where they tested various 22 cans on various platforms.
The AAC Element 2 seemed to audibly be the most quiet (backed up by readings) on pistols, and did not have a FRP.
The Silencerco Sparrow had a FRP on pistols, but not rifles, and I think the Sparrow was as quiet as the AAC Element 2 on rifles - they tested on a S&W 15-22, which is where I park my Sparrow.
I guess you'll have to take into consideration where it's going to spend most of it's time? If it's going to be on a pistol, the light weight, size, and lack of FRP really make the Element 2 look good.
If you're going to hang it off a rifle, then size / weight / FRP (as longer barrels seem to help eliminate FRP) may be less of a consideration?