Space Race as an expansion is worth checking out at some point, but I wouldn’t be in any hurry. It ultimately does little to solve many of the deep-rooted problems the game still has at the mid-to-late stages. It does make the early-game a little easier, or at the very least more varied (depends on your settings), and there’s definitely some interesting stuff there. Surviving Mars still has a fair ways to go though, and it’s going to take more than small injections of personality to carry it over that hump.