I have indeed tried Markor and used it for quite a while. Atleast several months if not a year. It doesn't hold a candle to Obsidian.
Just two things off the top of my head among plenty of others:
1. No live edit mode in Markor. You can either edit or see the live preview. (Not sure if that's changed in recent times).
2. Here's the most thoughtful killer feature IMO of the Obsidian mobile app: it let's you configure the order of formatting tools that appear on the toolbar above the keyboard. This let's me put the checkbox edit and indent as the most frequent actions on top left. This makes my life so much better.