For me personally, I didn't see a big need for 3p's functionality with the sensors, or use of the remote. I only ever need to actuate the suspension while in the car, and the additional presets for V2 on top of lower cost and simplicity were a no brainer. I don't have any experience with Accuair or anything. All my friends and I are on AirLift.
These are the prices I have seen for the main manifold plus the 2nd compressor harness
v2: $1160 ... 3p: $1370
$210 difference between one or the other is not too big a deal for me. Although like you, I like the 8 presets of the v2.
I need to find out what other differences there are between these two, besides being able to install height sensors in the future.
The Accuair from what I can see would be like ~$1600 for the manifold and height sensors, plus another $225 for the key fob.
(I don't want the height sensors but seems like the Accuair key fobs only work with the height sensors installed).
And this key fob is the only reason I would like to go Accuair over Airlift.
I really like the simplicity of Airlift's all in one manifold more than Accuair system.
Now that I write this all down I see it's just a question of if I am willing to spend an extra 4 to 6 hundred $ for a key fob (and height sensors).