When you get bored after a playthrough or two, you can install the long war mod and it'll add a lot more replayability. X-com games' main draws are replayability. *edit: Also thought about replayability, and people say Mutant has none unless you want to replay on a harder difficulty or achievement hunt. Humble has xcom 1 and 2 on sale for two more days with X-com 2 for $14.99 (or $13.49 if you are a monthly subscriber) If X-com 2 is not on sale right now, wait a month for Steam sales or check other sites like the humble store in the mean time. Again, I haven't played Mutant that much, but I imagine X-com 2 is longer as it also has expansions for it. They both have a stealth aspect where you can set up ambushes prior to battles, but X-com 2 some missions time you and you have to complete it in a certain amount of turns whereas Mutant is more exploration.

X-com also has full customization of your soldiers and a lot more upgrades- Mutant lets you change weapons as you find or buy them, but I think customization is really limited to that and what upgrades you choose to mutate your dudes. Mutant has banter between your dudes but x-com all the talking is usually between missions and only about missions.

Maybe it's because I didn't play very far yet, but x-com 2 feels like it has a lot more to it.

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