Best system for dungeon crawls?

[Targas]

Did you think about 13th Age for a dungeon crawl? Combat is interesting and fast paced, there is a very good adventure available for it, which would probably hit the nail on what you want: ‚Eyes of the Stone Thief‘ by (horror author) Gareth Ryder-Hanrahan, and if that‘s not enough they recently released a Glorantha (Runequest) setting for it called 13G : https://www.chaosium.com/13th-age-glorantha-pdf/

... only drawback. Just the ruleset and bestiary is available in FG. So the adventure has to be entered manually with the proceeding of the gaming group.

[NineShadowEyes]

My vote is for Labyrinth Lord with the Advanced Options stuff added in. I ran a dungeon crawlish mini campaign with this and it worked really well. It was loads of fun.