I do not use either, I used to use the MXR 10-Band EQ m108 Graphic EQ Pedal and went through alot of others prior to it and after (not the EHX but was never really satisfied. Anyway eventually I ended up using my MarkBass SuperBooster in the FX Loop and of all things unholy it is truely BEAST. I was already very familar with MarkBass amps but despite having the same very powerful but as natural or agressive as you wish VLE & VPF filters: I've not looked at another EQ since finding the right one (here just incase man:
Markbass - Super Booster). It also works well hitting/shaping an amp's front-end but IMO far more useful in the (series obviously) FX Loop, YMMV. Oh and the now discontinued PreSonus EQ3B which is a fully parametric yet highly portable little-ish box which allows a heck of alot of room for adding steroids to one's tonestack, Again YMMV and sorry I've not got anything to say on the EHX valve EQ pedal
Hope that is of some help, All the best
Dean