Pretty much Fromsoft games and Bethesda games. Horse armor aside (which I never bought), both developers make expansion content that doesn’t reuse assets and adds significant hours of content to the game that’s on par or even better than the main game’s content.
BioWare used to be good at this too; ME2 and 3 had top notch Add-ons and the Awakening expansion for Dragon Age Origins was pretty good and rich on content for the price. Now they can’t even make games as good as past DLCs.
Most other Add-ons/DLCs for other games I play just feel lazy or half assed because they reuse assets, are too short for the price, and/or have half baked gameplay that isn’t as fun as the main game. The most recent example of this I played was RE8’s DLC. It was nothing but reused areas from the main game, and it was more of a walking sim than an RE game. Thankfully got it on sale. In comparison, at least RE2 Remake’s half-assed reused asset DLC was free.