Picking the right Dudu7 model

I was planning to buy a cheaper head unit for my 2012 Civic that I'm trying to squeeze a few more years out of, but I think the potential smoothness and polish of the Dudu7 models has won me over. I have a few questions I've had a hard time getting an answer to:

1. A flush fit 9.5" kit is available for my car, but I'm not sure if I should opt for the 11" model instead and use a 2-DIN universal mount. I like the square edges and I THINK it would fill out the space between the car's vents without looking sloppy.

I might want to transfer the head unit to the next car I buy, and I don't know if the 9" would seem small in a newer car or if the 11" is inconveniently large. Or if there's any build quality differences between them.

2. The ADAS system is a big point of interest, but I've also seen people say it's gimmicky / worthless. I've had a front collision warning prevent a likely accident twice in my better car (with a real factory system). Has the ADAS system improved at all since launch? Is there another brand of aftermarket ADAS that's better / worth considering?

3. Is there anything on the substantially-cheaper side worth looking at? I'd honestly be fine with a unit that didn't have much horsepower as long as it could run Android Auto smoothly, sounded at least as good as stock, and ideally supported 360 cameras that were usable.