If you can, ride some. Certainly the Airdrop and the Aeris should be viable.
I ran into a similar conumdrum last year and plumped for the Aeris. I chatted via email with Ed and met up with Dan from Bird. I didn’t go for the Airdrop because it was a little heavier, a little more DH focussed, and didn’t have stealth routing (which the mk2 does).
I test rode an Aeris on a filthy Feb nightride with Dan and liked it. It pedalled and climbed well, and descended even better. I then went to Bird to make sure I needed a large and not a medium. After buying I didn’t like the colour, so went to Bird again and did a straight swap – Ben prep’d the frame in front of me and I ended up buying forks from him too.
I like my Bird a lot, but a good mate I ride with also likes his Airdrop a lot (admittedly he does hit bigger jumps and drops than me).
I’d buy one or the other very happily – both companies are great to deal with and TBH I don’t think you can go far wrong with either. I’d just think about what you want it for and look carefully at the sizing.