What current state around UI in UE4 now and it's comparison?

Hi, half year ago i asked about UI and got some understanding that there are:

  1. slate UI (developed by Epic games)
  2. Coherent UI (3-rd party web based overlay)
  3. UMG (as i saw it’s UI built on top of slate and accesible with blueprints)

Is it all possible ways? I don’t count way with ingame objects because for me UI is strongly overlay and only in very rare cases any game objects. Some time ago saw post about even raw 2d or something like that.

Would be nice to see links for tutorials of every type and comparison at such things like “cost” (cost to CPU, not a price), “complexity” for make, “capabilities” (maybe some type can do something and can’t other).