Yeah, I think the options for material-ui are:
MaterializeCSS is an option too, but, I think it’s silly when using to react to go to the trouble of using a complex div/css setup.
Of the other options, some if it has been discussed in other threads, but from my own experience, material-UI is more complete, but super non-performant. When you figure this out, you’ll find performance threads dating back as far as Nov 14. I think they’re closer to implementing a fix for this (using react-look from what I recall, for more performant theming), but something to be aware of.
React-toolbox is a lot less complete, but much faster… I’m using this currently for a small project and they’re very open to PRs and Meteor support, which is great. Using via nathantreid’s css-modules package.
I never had a chance to check out Essence, I believe it has a greater focus on mobile with it’s own grid system, iirc.
Should also add React-Ionic to the list (haven’t tried it yet myself).