I'm talking like Wizardry, Etrian Odyssey, that kind of game.
What is the VERY BEST one of all?
They all have different things to offer, so there's no absolute best.
Even Rogue (the original roguelike) has its own strong points compared to say Nethack. Neither is better though. Rogue is ideal if you just want a simple and quick tactical game, while Nethack is something to spend years discovering tricks and ways to exploits situations.
Shiren the Wanderer
>>3340298
Shiren is a Roguelike, not a Dungeon Crawler.
Ultima Underworld
>>3339614
Eye of the Beholder 1 & 2