Gup: I've no idea what the "best" monopod is; there are dozens to choose from. I can offer only my own experience and opinion.
Not being a sports photographer I don't use a monopod that frequently. But I have tried several brands and models over the years. My personal favorite, and the model I currently use, is the
Bogen/Manfrotto NeoTec 685B (a relatively new model of their NeoTec line. It's lightweight, extends with a simple pull, retracts by simply squeezing the top lever (there's a safety on this model to prevent accidental release). Once extended it's as sturdy as any model I've used. It might not be optimal choice for someone who uses enormous lenses but the longest lens I use is a 70-200mm with an extender and it's just ducky for that.
Hope this helps.