DSP has granular delay, overdrive/bitcrusher, Leslie Speaker
DualFX has high pass delay, stalker reverb, ripper, and dual pitch shifter.
They have in common stereo delay, mono delay, reverb, saturated reverb.
I don't have pico DSP, but I have a pico module and the dualFX. I prefer the knobs/aestetics of the dualFX, but if you're working with 88hp then you might want to save the extra 4hp. Also depends if you just want to use one power connection instead of two.