well, to me it doesn't really matter if it's analogue digital banana or grapefruit, but...
Echo Pro Line 6- cool IMO, sync works but manual is better, algo's sit nicely, needs amp because built in output amp is complete and utter shite
Roland Space Echo- AAAAAH yeah, instant space, don't own one but... it rocks, one trick pony, pretty standard here in studios
Sound Craft weirdo box- got this last week, pretty weird. digital and crappy thumbsup
BBD- a bucket brigade delay. a chip with little dwarves inside passing buckets of audio. Moog, Doepfer, various others (lexicon). unique sound, but love it or leave it.
Logic built in delay- it syncs, it grooves, it hasn't got much of a character mwehmwehmweeeeeeeh
midi delay- yes. copy paste. why not?
Cowdelay- itttsss we.. it it it's weird and it stutters
Kingdubby- roll one, light up, instant dub
this is what I use, more often than never.