In sort: there ain’t shit out there.
I found a third option: Known. Known seems to have Indieweb webmention support built in. Like Micro.blog and Tikiwiki there are some catches: it’s not listed in any hosting panel for auto install, it’s not even at version 1.0 so technically it’s a Beta, very limited eco system, development seemed stalled for awhile but I hear it has restarted.
Micro.blog. Moving my Wordpress site from ramblinggit.com to MB would still give me partial Indieweb functions, excellent support, constant development and a great posting interface. The downsides, strictly for me, no comments or incoming webmentions, no categories or tags, third party site search only. On other things I I have plugins for on WP I could probably find a work around on MB using pages. I think all these things will be addressed in time but, right now it’s just not ready to take on the job of a web presence.
TikiWiki. Frankly, if I was starting out now I would be really tempted to use TikiWiki. It has everything, not as a plugin, the stuff is already there: Blog, wiki, forums, directory, articles, newsletter and more are all part of the core script. The only downsides are: zero Indieweb elven goodness, I couldn’t find any cross posting capability. Work arounds: Bridgy might provide some Indieweb goodness and I know can syndicate using Micro.blog. No Indieweb is a big downside but surprisingly it’s not a deal killer for me.
I have a couple of years to make a decision. I’m thinking some more blog scripts will start being developed in response to Gutenberg so it’s wait and see. In the mean time I’ll keep a weather eye on these three.