I like various BRP/Mythras/Percentile Systems for Sword and Sorcery the most. If I was going to keep it super light or one shots Barbarians of Lemuria is good, just not enough crunch for me for long term campaigns. Followed by various OSR possibilities for some of that old school feel, but normally if going to crunch i prefer the BRP/Mythras choices.
I voted for DCC but now I think I should have picked other for Sorcerer and Sword plus The Latter Blue Tome of Amaxathroth the Cursed. The latter supplement (which is free on Drivethru) is the closest rpg material to Clark Ashton Smith's work I have ever read.