I'm an Android guy, new to flying, looking to buy an iPad. Will be using ForeFlight and probably several other apps I don't even know about yet. My headset is a hand-me-down Zulu 3 from a buddy.
If you're an Android guy, I would suggest only getting iPad models that have USB-C. Even if that means waiting a little bit.
I'm an Android guy too, and needing the different style cables is pretty annoying to me. Not the end of the world, but the USB-C form factor solves most of all that. This includes the headphone adapters too...if that matters to you.
Your Zulu 3's are bluetooth??, if so the connector shouldn't be a problem, (if you want to connect with those).
I haven't used face ID, but I do like having a button. I guess you can use a PIN or pattern instead if you want security on??
I also think you can set it to keep the screen on with foreflight. I use FlyQ, and it does that, but I'd only imagine FF does as well.
The new 11" looks more attractive at this time than the 10.5".
As far a memory, I've never used more than 32Gb, but I keep mine only for flying/training, so 64Gb would be plenty to me, and save about me about 150 bucks.
However, I'd prefer what a lot of the other folks said... a 9.7" that's all screen and not much bigger than the Mini 4.
Hopefully others will chime in with their thoughts.
Also, for anyone that might not know, you can get some money for your iPad at Apple.com through the trade in program. Haven't checked it out, just saw it as an option.