I use digital Delay to create Space, as in placement in a mix. Speed, depth, and degree of regeneration are intertwined in setting it, and I try to avoid extremes. I use Analog delay similarly, but it's coarser, less precise, and if set carefully, and act more like a Reverb effect, but nore often than not, I find either type of Delay a less-than-adequate substitute for Reverb.
I use Reverb sometimes instead of, but usually as well as or preferably after Delay to create Air , as in room ambience, or, in other words, in photographic or visual terems, Depth Of Field. Too much Reverb can throw sound out of focus. Digital can be colder or more 'brittle' than Analog (Spring), so I prefer a Spring tank.
IMO, in short, there's a purpose for both and they need to be independently controllable.