It's going to be an interesting battle.
Patreon is more recognized as far as supporting creators, but only a certain percentage of what's give to creators actually makes it to creators.
I think the Basic Attention Token is also going to be a huge competitor to SMTs as all you have to do is register your website to start earning BAT, but that requires either showing your visitors how to sign up and use Brave/BAT and then getting them to give you there "earnings"
I still say one of the biggest draws to Steem is that you can earn Steem with no fiat required and then use that crypto to purchase or support other projects like Splinterlands
I think onboarding to a new social media site would be easier than convincing people to use a new browser and think that's where SMTs have the edge. Still interested to see what partners Steem has with the release of SMTs and can't wait to see how those partners are planning on taking advantage of SMTs.