Handling Luck or Chance rolls

In several games, both new and old, are chance rolls. Typically, I've seen these handled with a d6 (there's a 2 in 6 chance of an ambush) or d% (there's a 50% chance that your spell fails).



Out of simplicity and streamlining, I'm thinking of just handling this with a d20 (close enough to a percentile, more "granular" than a d6).



Have any of you done something similar, assuming that you were not wholly satisfied with either the d6 or d% options?

Handling Luck or Chance rolls