2 great delays. For versatility & features, I like DD20 because a) various delay types to choose from (including modulated which is great), b) all important presets, c) you can dial in time exactly by ms number, d) sturdy pedals and design.
The Memory Man can be a little underwhelming. The old ones sound much better. The best 'Memory Man' style delay I've heard is the Diamond Memory Lane. It sounds amazing and is (to my knowledge) the ONLY analog delay with tap tempo!
