The ps-3 is far superior in most regards for me. What were you looking for the pedal to do ? The biggest difference is that the ps2 doesnt have an expression input, one of the reasons most people want the ps3 is its psuedo whammy function.
I guess what im asking is what aspect are you asking to compare? The harmony function? the whammy function? the detune/chorus? the delay ?
For bass it's only the delay settings which are worth talking about - all the pitch shifting options don't sound very good with a bass plugged in. On guitar it's another story...
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