First off, I get that the El Capistan is going for something different being a tape echo emulator. I also own a Maxon ad900. The Strymon is awesome with clean tones, the wow and flutter sounds ace and the verb useful. All sorts of cool sounds in there. DD-7 seems to sound just a little better with distortion on the analog mode though. It has a better (for my purposes) looper mode, stereo ins, reverse, a marginally smaller footprint. Of the three the DD-7 is the one which has made it on my 5 pedal practice rig at the moment.