It's quite low quality really. Most of those stuff is made with outsourced assets and it still doesn't have features like SSRR, a proper AOS, inbuilt MB, PPCC effects, DOF and many other things that come with UE4>>529176
I'm not sure about licensing but as far as I know, if you gained a certain profit like above 500K, you need unity subscription. You can't just buy Unity, you need to have had subscribed to it. It's wierd like that to be honest, UE4 has a better system for licensing.
Nevertheless, both UE4 and U5 is pretty good. Unity is better for indie games with a simple structure, is more platform friendly and easier to prototype with but if you're going to make a next gen blockbuster game it's UE4 all the way.