I’ve never played XCOM but it’s very similar to fire emblem in the battles itself (at least so far). There are multiple choices though that basically decide the story so it adds to the replay-ability. I’ve only come across one so far as I’m not far into the game at all but you decide which route you want to go and it’s very obvious that it has entirely different consequences (the game straight up tells you this). So to answer your question, I don’t know.
Heh, sounds like it's Fire Emblem basically, which is mostly linear missions with story decisions available to the player(which is fine). Maybe I'll check out a review or two, see if I like the themes of the game.
In XCOM games there's a strategic layer where you control your base/research your stuff/and send out forces to attack/scout out stuff. These create missions that you send your squad of forces into. For example, shoot down a UFO, send in your squad to secure the crash site and try to capture/kill aliens and get their stuff to research. These missions are usually a collection of tiles that build the level ands its layout for the mission(though some missions are always the same in every game, like the final mission). Of course, you can still see some familiarity, but it does enough to keep things fresh. Sometimes the random generation can be unbalanced though, I remember when playing the first game one time my landing craft was placed in the middle surrounded by buildings on all sides with aliens in them and this was at night. Definitely not the easiest start.
I wish Fire Emblem: Three Houses had that for the side missions you could do each month, instead of just playing the same maps over and over again.
Edit: Oh, I see Triangle Strategy has a demo available, I'll just check that out and decide to purchase based on that.