I owned a mk1 aeris and thought it was a great bike/frame. (Sadly sold it as my back has been knackered for the past year and a half)
My only criticism is that with the bike being so long, it lost a bit of the manoeuvrability and fun that a shorter bike has on slow and twisty trails. The rear triangle had a bit more flex in it compared to my old stumpy evo (not sure if they have beefed this up on the new ones) One the flip side, when it was fast, open and rough the bike excelled.
The new one’s are perhaps a little too far in the reach department for my taste. A large is longer than my XL.
I’d prefer something with a little less reach and a slightly longer TT (Mk1 aeris had awesome geometry)
It’s good that they have included an extra size, so you can always downsize and get something a little less extreme.
No idea about the Airdrop. From the numbers it looks a little less extreme in the reach department and perhaps a bit heftier. Also comes with 142 rather than boost and a regular shock mount which is a bonus (I can’t stand the built in obsolescence that is coming with new bikes)
I wouldn’t count the Aeris out downhill, the original one was a monster DH so while the Airdrop might possibly be stiffer, I doubt it would be any faster DH. I’d need to ride them both to find out.
All that being said, I may end up with another bird in the future, but will downsize to a m/l or a l.
Bird also have an amazing warranty, so that would probably sway it for me, even though the boost and metric shock mount are a pain in the arse.