Whenever it's my time of the month, I've always use the brand called "Always". They are a pretty popular and reliable brand. I generally like the regular thick pads with average length. Many women like to use the thin pads so that they won't feel bulky, but I like to use thick pads since my flow is super heavy, especially the first two days.
This brand has always been a part of my life. My mom used it and I'm not very familiar, personally with other brands. I like the wings, every woman likes wings, pads won't last long without them. Always stay in place, and offer great absorption.
Always has around 30-45 of these pads in each package, great to last you for a couple of periods. I buy the overnight series for when I get to sleep, if I use the regular pad I find myself awake in the middle of the night and stumbling to the bathroom to change my pad, that's really annoying. Most girls should have overnight pads to avoid accidents.