not even close 
the MD’s delay is intense, and will very likely blow speakers or make you deaf if you’re not careful with the feedback parameter. It screams and builds to the point of complete mayhem.
The MnM’s delay is a bit less scary, and goes into a beautiful distortion with the feedback up. A bit more controlled than the MD.
The OT’s delay is a simple repeater, and I find it very disappointing. WIth feedback at 127, it just loops the audio, with no build up. Plain and boring, in my opinion.
The A4’s is wonderful, perfect for distorted, dubbed out chords, and insane buildups with overdrive and feedback parameters up. Probably my favourite of the 4 machines, although the MD’s delay is not far behind.

Cheers !
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