Best game- Resident Evil 2 Remake; it's just everything I want from a Survival Horror game. Its flaws are minimal and quality and faithfulness to the genre is outstanding. Cannot recommend it enough to Survival Horror fans!
Best Expansion- Monster Hunter World: Iceborne; still has those pacing issues from the 'story sections' yet improved in a lot of needed areas, namely the stat balancing. Focusing more on older fans than new I suppose but think it made a tighter and more replayable package than the base game ever was. Plus unlike World no added monster is a chore which base-World had its fair share.
*Shout out to Devil May Cry 5. I think its combat and bosses are excellent but held back by its odd pacing decisions and confusing level design.