I use both on just about every patch I create. I think the real issue comes down to how your using it. If your not big into processing gear and atmospheric type sounds then there is plenty of DSP, but if your into WDW with a lot various effects both pre and post then your going to use the DSP up really fast, which is fine becasue if your into that sort of thing (which I am) then you want tons of other processors anyway such eventide 3000/2016, plus multiple lexicon and TC stuff. I cant tell you how pleased I am with the Helix, extremely powerful (especially considering 30 years ago I bought one of the first ADA Mp1s made and ran it through a midi-verb 2!), easy to use, and best of all, every patch I create simply sounds amazing.
It really is remarkable, I can seriously simulate WDW on a stereo cab, of course the effect is a lot greater through 3 separate cabs, but ultimately everything gets summed to stereo anyway.