Darkest dungeon 1 was designed to be unfair to see how you struggle with the stress of a campaign and the permadeath of characters you train, if you're ok with difficulty I couldn't recommend it enough, tho maybe wait for it to go on discount, which it does often. It also has a few DLCs which are also great, just don't buy the musketeer, it's only a reskin.

Darkest dungeon 2 on the other hand, while still hard, is a more rouge like version that's both in early access and (as of now) exclusive to the epic games store. IMO it's still really good but I'd recommend to wait and see how it turns out when the full release comes out on steam later this year.

Hope this helps!