I never edit pictures from my camera on a mobile device, only on my laptop, its not part of my workflow. I do however edit phone pictures taken on the phone and for that I only ever use snapseed.
When I do travel and landscape photography with my phone, I generally use Snapseed. However, I mostly use Lightroom/Photoshop on pc to edit my macro images.
I haven't used or will ever use my smartphone / tablet to edit my photos. Snapseed seems to be famous, but that's not something which I'm interested in.