[LolWolf]

Just adding to this: TeXPad is what I use on both my laptop (when working on a big screen, though I mostly use Vim when working from battery) and my iPad mini 5 (+ a little bluetooth keyboard) on flights and before meetings.

Honestly, using that + iCloud syncing (+ Git, on my laptop) has been great: all of the changes I do sync across all of my devices, as do the PDFs, which I can easily bring up in meetings, while also having the plus side of git (diffs, general VCS niceness) once I get back to my computer and commit the changes to the remote repo.

Of course, unlike the OP, I'm not aiming to completely replace my laptop... I'm trying instead to augment my workflow to not carry my laptop to meetings, while waiting for people, etc.