Picking a new notes app

Due to sync issues my faith in Apple's Notes app has been shaken. I'm aware I can most likely fix this by turning the iCloud toggle on and off on each platform, but I shouldn't have to. So I'm looking for a replacement.

My requirements are:

  • Simple
  • iPhone, iPad, and macOS
  • Plain text
  • Markdown
  • Flawless sync

Bonus

  • Code snippets
  • Inline images

So far I have shorted listed these...

If anyone has any other recommendations tweet me @eddielee6.

(Side note: I opened Notes on my MacBook while writing this to copy the shortlist I wrote on my iPhone - and it wasn't there...)