Running Old School systems like 1e AD&D/OSRIC or BX D&D/Labyrinth Lord, I use a modified XP system which most resembles OD&D's 100 XP/hd, but is also influenced by the 3e XP system.
Running 3e I use a somewhat modified system, typically 0.5 standard monster XP plus goal, roleplay etc XP on top.
Running 4e I use the system pretty much as-is. You already have to calculate the monster XP when encounter-building so I might as well use it. I'm more generous with 'quest' XP than the listed standard, though.
Running 3e I use a somewhat modified system, typically 0.5 standard monster XP plus goal, roleplay etc XP on top.
Running 4e I use the system pretty much as-is. You already have to calculate the monster XP when encounter-building so I might as well use it. I'm more generous with 'quest' XP than the listed standard, though.