Very good and much easier to setup than Kodi due to the add-ons being cloud based vs locally downloaded. I still recommend learning Kodi as a more reliable backup. The torrentio addon for Stremio goes down on occasion for a few hours which can happen at inconvenient times. Lately it's been pretty stable though.
Having both set up and synced with trakt is recommended.
Actually, you need to look back, Torrentio is not perfect because of the recent downtimes, improve Stremio with more add-ons with Debrid access and you are good.
It's stupidly good, I honestly couldn't believe it when I started using it. There was one time that it didn't scrape the right stream, though, so it might be good to use Kodi with a Debrid-compatible addon as well for those rare cases (Seren, for example).