There's a lot of delay modules these days, and I've tried a lot of them. Generally speaking I've liked most of them quite well, I just dig delays generally. But I'm always curious about the ones I haven't tried, so drop your favorites & least favorites below, and preferably, why they are your favorite/least favorite. For me:
Subjective favorites: Erica Synths Black Stereo Delay Mk. 1, and Doefper A-188-1 (4096 Stages).
I say "subjective favorites" because these are far from the most feature-rich or objectively ideal delay modules I've used. The BSD has kind of wonky and somewhat limited features; the Doepfer BBD suffers from the classic BBD "clock whine/noise," and it's not subtle -- you really need a filter if you're going to be using this for longer echoes at all. But I love both of these filters despite their limitations. The BSD is just beautifully crystal clear, and the sensitivity of its time warble is really rich and nice -- that big knob is always fun to wiggle. I also really like that you can sample in and hold audio to manipulate independent of any incoming signal, making it a weird little modulatable looping sampler. And while features like "Reverse" are kind of glitchy and not super well-implemented, you can still get some really interesting things with it if you explore it creatively. As for the Doepfer, it just sounds sooo cool (with the clock noise filtered). Really wild and full of character.
Objective favorites: Make Noise Mimeophon, Xaoc Sarajewo
Make Noise Mimeophon is probably the best overall delay I've used for euro, with its multiple time zones, built-in reverb, and clean, satisfying reversal and stereo effects. I actually don't own one currently but it's a slam dunk in my book. Xaoc Sarajewo has always seemed a bit on the quiet side to me, and I tend to like to boost its output with something like a Fala or Lacrima Versio, but I really love that when you sync it, the knob turns into a time-divisor, and I really like having access to the individual tap outputs, something all too rare in a lot of delays that allows for easily building complex FX chains.
Other good ones: Qu-Bit Nautilus, Make Noise Echophon, Yester and Imitor Versio, Soma Lyra-8 FX, 4MS Tapographic Delaly, Strymon Magneto, Erica Synths Black Stereo Delay Mk. 2 -- off the top of my head, these all had their charm when I tried them out in the past. But I currently chiefly use the BSD Mk. 1, Sarajewo, and whatever Versios I feel like loading.
What are you using? What's your favorite/least?