Mostly for lack of a better place to ask and not being worth it's own thread, is Civ 5 with expansions or Civ 6 a better choice?
I've got the base for 5, but none of the expansions, but the expansions are the same price as 6 right now thanks to the Steam sale.

Normally I would assume that any major improvements for the previous game and expansions would be incorporated into the newest game, but I know there are things from Civ 4 that weren't in Civ 5 until the expansions. So I'm not sure if getting the base Civ 6 is going to have those improvements or not (off-hand it is things like spies, religion, more diplomatic choices, other ways of spreading cultural influence, better ability to protect weak units)