From an Air 2 (not the newer Air 2S), it's definitely a big upgrade to the mini 3 pro.
If you meant air 2s , you'd lose some stability, and 10bit dlog video etc , but gaij upward gimbal tilt to 60 degrees , and ability to get up to 47m flight time with the extended battery (but puts you over 250g when you do)
Other places , won't value the old air 2 even close to the air 2s or mini 3 pro in terms of trade ins.