• Under 25% - Fastest Roll
• Between 25% to 75% - Varied Medium Roll
• Over 75% - Land Whale Roll (Fat Roll)
• Having under 25% is fantastic, since it has the most Invincibility Frames, though you can't go that route with heavier armors unless your equip load is massive. Tip - Great for the "Witch of the Lake" boss fight.
• Medium Roll is okay, have at least a medium roll if you can't achieve a fast roll.
• Never go full land whale (unless you're using an Iron Rampart, then it's ok), you will get hit by everything and will know the word "Obliterated" by heart.