has someone comparisons?

I don't have either, but I have had the CE-1 (which the Retro-Sonic is a clone of) and a bunch of vibe (like in the CC2) - they are different beasts. The Retro-Sonic is a Chorus/Vibrato and the CC2 has a Uni-Vibe clone in it. The "Chorus" switch on a uni-vibe is missleading as the circuit (and sound) is more closely related to a phase shifter than a true chorus pedal. Yeah, both pedals do swirly stuff but in a different way.