Frankly, I dont know much about 'wiki', but seeing what markdown extra has (which can easily be enabled in Plone), it would fit every need I 'ever need' if it was possible to enable 'add link' (which should be possible by making a a browser view to add new content.
I think (probably) everything you see at https://stackedit.io will work in plone. There is also a wiki link extension that I have not tried: https://pythonhosted.org/Markdown/extensions/wikilinks.html