It's WebTorrent for me when I need to watch something immediately.
Stremio is centralized and has terrible license. No, thanks.
While some of the things they are working on seem cool, overall I would not touch it because of the previously mentioned problems.
Popcorn time really is a community project and it doesn't try to earn money by working on a tool that provides pirated content.
Care to elaborate?
supports commercial providers (Netflix, iTunes, Hulu) to find content, magnet links for webtorrent viewing, plugin architecture, no affiliate links or adware, and their github is currently live