About two years ago, I bought an "assortment pack" of about 20-25 different ear plug brands/models. I diligently tried each pair and made a few notes on the fit, effectiveness (subjective measurement on a cruiser), and durability. After about 6 months, the Pura Fits stood out by far. I then bought a whole carton of them and have been very happy.
One note, however. Last fall I had a slight ear infection and my ear canal was a bit swollen. Didn't hurt, mind you, but the earplug's expansion created a bit of pressure that could have been bothersome to some folks. So, if you tend to have small ear canals, the Pura Fits may create a bit of pressure.
Buy an assortment pack and see which ones now fit you the best. THIS is one of several places that sell them.