XCOM

WotC's difficulty curve is weird, it starts out harder then base xcom 2, but once you learn the mechanics and figure out what works it becomes a lot easier. Covert operations give you a lot of resources, can stall the avatar project forever, and can be used to power level someone to max rank significantly faster then base game. Lost missions are essentially free xp. Black sites are trivialized by reapers, who can reliably solo them even as squaddies, making stalling the avatar project even easier. Reapers in general are very strong due to the absurd stealth, and remote detonation ability you get at corporal, not to mention banish which lets you one shot just about anything. There is also the training center, which lets you get every ability for a class plus some extra ones assuming you spend the time to get the points (Covering Fire + Threat Assessment + Cool Under Pressure is an insane combo on specialist). The new terror mission variation is significantly easier because the rebels actually shoot back now.
The Chosen can be a mess, but as long as you aren't in a bad situation already they are pretty manageable. The only thing that gets harder overall that I've noticed is the alternate supply raid mission with airlifting crates, still can't figure out how to do that one properly although I think it might just be a skill issue on my end, haven't heard anyone else complaining about it.
(replied to your comment, but it didn't show up, so if there are two comments here sorry about that)