The first thing to consider is the ‘flavour’ of markdown you will be using. DT uses multimarkdown. IA writer uses a subset of multimarkdown plus wiki links (not a markdown standard but used by DT). Obsidian uses wikilinks but has its own version of markdown. IWriter pro does implement multimarkdown but not wikilinks. Typora is again has its own version of markdown based (I think) on common mark.
I do a lot of writing and IA writer allows you to highlight verbs, adverbs, adjectives and also highlights redundant words/phrases. This helps me write well.
Typora tries to be more wysiwyg, hiding the markdown once entered. There is Markdown Composer (which is free) and does implement full multimarkdown like DT.
Then others included Macdown, BBedit, and the list goes on but few have the full multimarkdown spec.
My only advice is find the editor that suits you, DT itself is pretty good. The only reason I use IA writer is the additional writing aids it has.