X3 is a fun game, with a very developed universe (you’ll see factions conduct invasion in real-time as you do your own thing) with a wide variety of gameplay. The universe of X3 honestly makes Star Citizen seems like a theme park for children.
That being said it is extremely difficult to get into them both because there are so many gameplay options and the UI/UX is subpar (prepare to be constantly fiddling with menu and looking up how to execute a given course of action).