I recommend mine, as I only use recordings from the actual aircraft and weaponry (which is the main reason why updates are few and far between these days).
Though that's not to say the other sound packs aren't good --- they're great, but I still recommend mine for the highest level of authenticity. I've rebuilt my entire database several times over, thanks to subsequent floods of higher quality source material... So, if you download any of the packs currently on my site, you're getting very old, edited source material, and believe you me, it doesn't sound a tenth as good as the stuff I'm working on right now.
And do keep in mind that, since I'm going for the highest level of authenticity, I don't model my source material for headphones --- engine sounds are loud, gunfire is equally loud, and explosions are earth-shattering. Fly through a sky littered with flak explosions with the default sounds, and you won't even think twice about your safety... Fly through the same stuff with my soon-to-be-released explosions pack, and you'll jump out of your seat (turn those speakers and subwoofer way up for the best effect).
Sorry if this is a bit shameless, but I take a lot of pride in my work, no matter what that work may be.