I'll jump into this fray:
I got a Chinese Cube I6 that is out of production that is dual boot to Windows 8.1 and Android 4.4.4 AND has an onboard GPS
Also a Tiny Deal dual boot Windows 10 (which I hate as an OS) and Android 5.1 AND an onboard GPS. It too is OOP.
First off the onboard GPS sucks the battery and is only visible in Android. I had to hunt the internet for a program called com0com:
https://com0com.sourceforge.net/ and GNSS data interface:
https://support.black-it.eu/en/products/gnss data interface/index.htm
I had to use those two programs to get the GPS visible on the "Winblows" side. PITA to setup but got it to work.
The memory access on the Android side on both of them is limited, 4gb on one 8 on the other. I can store enough maps for GPS rocket locator ok but it's memory is limited to 4gb on the Cube. Works ok and all that.
On the Winblows side the memory is much more liberal and I can use a 64Gb MicroSD on the Cube and 128Gb on the Tiny Deal.
I use a variety of tracking programs both 900Mhz ISM and on the Ham Band. All my rocket programming apps, Rocksim, Burnsim a variety of deployment device programmers work.
Lack of onboard GPS is really no big deal I've found out. Just pair a cheap GPS dongle and SHAZAM! You have your base station position. I've used one with a Winbook TW801 that is Windows 8.1
and doesn't have an onboard GPS. Works fine.
You won't find dual boot products in the US as there is a manufacturers conspiracy to keep them out. You'll have to order online from China and take a risk. Cost me $50.00 to send a defective device back but they did send me a new one that works. I see some on ebay but someone bought 'em from China and had'em shipped. If you find a dual boot tablet that HAS a GPS post a link.
Also, count on running it off an external battery as these devices suck juice fast. Not an issue as there are a mess of external batteries one can get for a decent cost.
Don't expect to read the screen in the sunlight. You need to get and apply a matte screen protector and paint the inside of an appropriate sized cardboard box with flat black paint. Leave one of the flaps attached so you can position it to further cut the glare. You need to get as deep a box as you can handle so it gets out of the glare. You only using inside your car/vehicle, you can forego this. If using outside for tracking, it's essential and required.
You CANNOT see the screens on these things in the sunlight period without cutting the glare.
You want as big a screen as you can handle. If using for tracking you need to use one that is comfortable to carry one-handed in your box but not so small you can't read the screen. Even with a box, there will be some glare.
I look like a kook once my rocket disappears and I got my head buried in the box looking at the screen. Once the rocket is coming down, I know what direction to take a peek and see if I can get a visual.
If no visual, navigate to the last known position and a new position is picked up to the final resting place.
Ummm, another thing. All three of those devices cost a couple of hundred less than an Apple Iphone.
I like the options the dual boot devices offer me and they were cheap. Unfortunately not available anymore with the onboard GPS. Only thing Android I like for rocketry is GPS Rocket Locator now. That program is just simply "DYNOMITE" for tracking a rocket on a map with offline capability.
Kurt