This is just based on my style and experience but the Green Gargoyle is what I use for light oil. The Blue Gryphon I can use on light-medium conditions. For medium oil, I use the Red Executioner or the Blue Warlock. For med-heavy condition, the Charcoal Executioner. Note that I have only mentioned the reactive balls, not any particle balls. Again, this is only based on my style of play, someone with more or less revs, ball speed, release, or definitions of lane conditions may have a different opinion.