The best overall Wah pedal would be the Gig-FX Kilo Wah
You may not be over familiar with Gig-FX, but if the Kilo-Wah is anything to go by, you soon will be. It has four modes to give you all the filtered sounds you’re likely to need, from a classic wah tone to a modern, biting wah sound with an extended frequency range. Just a overall GREAT Wah pedal for any of your guitar needs.
Second best would have to be the dunlop ZW45 Zakk Wylde Signature Crybaby Wah pedal.
Sound is amazing when playing on full distortion. This pedal is designed to give that extra cutting edge tone. When using it on clean tones, it gives a slightly crunching sound so it is not as clean as I would like. I use it with a Ibanez Jem and a Fender amp. Sounds great when rocking to songs with full on distortion such as BLS or Metallica.