I have tried ceramic, diamond and waterstones. Without a doubt waterstones will get your knife sharper than any other method. I suggest a 1000 grit stone. This will sharpen your sport knives and kitchen knives the best once you learn how to use them.

The only drawback about it is that you will need to invest in a stone flattener, or perhaps a 12" by 12" tile and 220 grit sandpaper to flatten out the stone.

In the field though the best choice is a diamond sharpener. I suggest the DMT monocrystalline type, they last longer.