If one of them went truly multi-platform, I'd be delighted! A friend gave me a free Android Samsung tablet, and of course neither work on that so I'm forced to use Onenote for plot & character sketching, and Google Docs for actual writing! Onenote's not bad for plot sketching, but nothing like having each 'card' actually attached to each chunk of writing.
A few people have asked for Scrivener on Android but it's not a priority for LitNLat. My go-to cross platform format has been markdown, but you lose your document structure (at least when exporting Scrivener to plain text).
To be honest, I've done the Android thing (tablet and phone) for several years and it hasn't lived up to my expectations. I've already replaced my tablet with an iPad. Recently, I cracked the screen on my Nexus 5 and I've decided as soon as I get my tax return, I'm buying an iPhone.