Delta 400 user here. Compared to Xtol, DD-X delivers much uglier grain and a more linear curve with less highlight compression. Actually it's the worst developer I ever used, but my opinion doesn't mean much because I stopped after a single bottle. YMMV. Clayton F76 has been described as a "father of DD-X" by a Clayton rep here on Photrio, I remember googling an old thread where he said that DD-X is a clone of F76.
TBH you won't find a better developer than Xtol if grain/sharpness balance is a priority.
Another thought I had while reading your post is that the results cannot be explained by a developer alone. I happen to think that Ilfotec HC is a superb developer, and maybe the lab wasn't using it optimally with Delta 400.
And finally, and I know this will be said by other people here, consider developing your own film. I do not believe that labs in general have the incentives to develop B&W films properly. If they charge the same price per B&W roll as C-41, they must be cutting corners, like souping different films using the same development time. In other words, blame the lab not the chemistry they use.
@images39 Oh! Small world! Berkeley photolab is my local lab. They use Ilfotec DD, not HC. This explains the results you're getting, because DD is the replenished version of DD-X.And by the way, they used Xtol prior to switching to DD, and their Xtol results were a bit worse than mine. They routinely under-developed Delta 400 in Xtol for me.
Xtol isn't "gone" - you can buy it right now from Freestyle or B&H. Probably others.
Northeast Photographic (located in Maine) says on their site that they "maintain a replenished XTol lime" (here: https://www.northeastphotographic.com/our-services). Prices arent that bad either.
Best to check directly with any lab that references using X-Tol, given that it may not still be available.
There are attempts by competitors to supply similar replacements, but I don't know whether the commercial labs are likely to take up those - particularly in North America.
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