If by shootout you mean to see which is best, probably won't be useful. They are all totally different monsters.
If you wanna hear what each type has to offer, we're having a mini tone fest at NTU coming saturday, maybe you wanna join us?
To really know what a pedal can do you'll have to hear it with the band. Which also means it depends on what the other players are using. I haven't heard the blackstone with a band yet, so what i've described is mostly theory based on what I heard.