No blend or reverse sweep on the JoshWah, and it's low pass. It sounds a lot like a Mutron III. It gets pretty clean with the gain down low, but not 100%. It has more range and is easier to dial in than the Fwonkbeta.
It is a contender for sure, but 'the best' would depend on which bass your playing, what you're playing on it, your fingers, and your ears! Each shines in different situations.
I've had it for several months and might let it go as I'm about to massively downsize my gear collection to clear out some clutter and focus on what I need in the band. But like I did with the MXR I'll probably change my mind several times (already sold one of those and bought it back again)!