Truthfully, I used to use Always Ultra Thin. I no longer use them because I m a very heavy bleeder and would go through 14-28 pads a cycle. I have found a more natural alternative that has slowed my flow with no leakage whatsoever and the best part, I use way less pads.
That would depend on what point it is in my cycle. Obviously if it is a day in which I'm heavier in flow, I use a thicker pad and when I'm lighter, a thinner one. I keep both on hand.