For me it's Diablo II. Granted I've played my fair share of D2 since launch, and also recently on a private server with a comrade from hexbear, but I still feel like years later the game didn't grab me as much as D1 did.
Granted I don't hate D2, but for a game that I keep coming back to, D1 takes the prize.
I like TotK but the engineering mechanic is pretty laborious. You have a lot of freedom but only a small percentage of what you try works, and because of the clunky interface it takes a LONG time to make multiple attempts.
Only having 2 of the 3 axes to rotate things on is the worst part of that imo
As much fun as it was building ridiculous vehicles and crucifying Koroks, it got tiresome pretty quickly. It actively dissuades me from going back to it as much as past Zeldas.