I have run Gaia on both android and iOS, and it runs far better on iOS. I specifically bought a 10" Samsung tablet for Gaia, but ended up using my 5" iPhone more as the experience was better on iOS. I am certain this is a Gaia problem not an OS problem, they seem to focus their development time on iOS.
Now I have a 13" iPad pro, and I have to say it is fantastic for mapping, so much so that I rarely break out the gazetteers any more. I use a inReach for GPS, but if you want to go all in, buy the cellular model.
This is exactly what I did: the Gen. 4, 12.9” iPad Pro, w/ cellular-enabled guts. I don’t have a data plan on it and, so far, there’s really no need for that—I have a hotspot I can hook up to if I gotta get it on the innerwebs . It runs Gaia just fine with zero hitches. I opted for the 1TB SSD and have been downloading maps and routes as quickly as I can. When this tablet is too old to run the app, then I’ll upgrade it to something else...probably another Apple product.
I got the gigantic 12.9 to serve multiple purposes: the mapping is easier to work on than with a phone and it’s way easier to see it across the cab, the iPad COULD run Prime or NetFlix entertainment (not a proponent of tech in camp, but you never know when this could come in handy) and also for media editing. It’s also nice that it charges on a 12V system...no inverter required (even though we have one). Available memory for tunes, books...screen resolution and sound quality are also top-notch for what the device is.
Costs more, yes, but I know when I touch that Gaia icon, it’s gonna work. Buy once, cry once. The last piece of tech I bought was my MacBook Air back in 2013...I’ve been saving nickels and dimes ever since....so I really don’t care that this thing cost the same as four new rims and tires.
I still have three BROG canvas bags stuffed with Gazeteers, MilePost (need to update this one), Benchmarks and Nat Geo pubs and a very trusty Suunto compass...and I will always carry them. Land nav is a huge part of my backcountry experience and I consider it an activity, not just a necessity.