In the past Dell was a reasonably good OEM for monitors because they were using the same panels, had the expectation of decent electronics, and could undercut other vendors due to scale. Now they have no real advantage.
In rare cases they put out individual models that are pretty good or at least novel. But I wouldn’t just buy an Ultrasharp because it has that “badge” on it, only if it is meaningfully better than the competition and competitively priced. And that basically doesn’t happen.