I’ve been playing Civ 6, with and without the mods. Custom Leaders and many combinations of mods tend to make the game desync after 100 turns on quick speed, but I enjoy it.
I’ve enjoyed civ 5 too but just haven’t played as much I guess. The DLC being so numerous, my rating of Civ 6 against 5 would depend on which “edition” you have. It bugs me that it doesn’t show which civs you didn’t own don’t appear until after you select them in the menu.