My whole family is embedded in the Apple universe, so it's an easy choice for me. We have an iPad Air2 128GB that we use for overland maps (Gaia, etc). It also holds about 50 iTunes movies on it, and our entire music library. We can play movies or music directly from it while using mapping software, and audio is routed into the car's stereo. It's an all-in-one device with a separate keyboard that can go in and out of the SUV at will. It is also our main home computer. It is flawless in how it operates, never has viruses, and hasn't slowed down in 4 years. That's the beauty of Apple iOS devices vs windows. (I can't speak for Android)
For ruggedization we all use (only) Otterbox Defender cases. I use their clip-on case mount/stand in the SUV as a mounting point, so it clips in and out. Very easy, low cost, and excellent protection.
I like that fact that I don't have a keyboard in the SUV. Less places for dust/dirt to get in. I don't type when underway usually, and if I do the iPad's on-screen keyboard works just fine.
I see people spend hundreds of dollars on mounts, but I'm a value person. I keep it simple and clean and inexpensive. That can be hard to do, but I've found the iPad/Otterbox Defender case/stand allows me to do it.
The new iPads and iPad Pros are bigger and faster, but ours has no problem doing anything we ask of it.
I'm sure the Android universe has something similar, I just don't live in that world, and don't want to form an uneducated opinion.