Steam and GOG are simply better platforms overall. If you really care about being DRM free and owning your games you go GOG route, otherwise Steam is the king. Epic does not even have a review system.

Epic however is the best source of free games on PC. A lot of the latest games I have played have been from Epic giveaways. Right now they have Outer Worlds and yesterday it was Ghostwire: Tokyo, both of these games I played few months ago after purchasing them through Humble Bundle.

Will I ever buy a game on Epic? Probably not, I prefer Steam, but those that simply refuse to redeem freebies and install their launcher while shouting things like it being spyware are weird.