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Dell P series monitors 2020 vs HP Zn series monitors 2018
The Dell P2421 24" is a great Monitor for its $238 asking price.
The HP Z27n G2, on the other hand, is not worth its $499 price tag and should be avoided by most people. We strongly suggest that you take a look at some better alternatives if you're considering spending around $540 on a Monitor.
The Dell P2421 24" hasn't managed to get enough recognition from sources that do high-quality hands-on testing and therefore didn't make it into any relevant roundups. That, by itself, makes it difficult to recommend.
Moving on to the HP Z27n G2: no sources that perform reliable and objective hands-on testing have included it in their Monitor roundups, which usually means that a product doesn't make for a good purchase.
As a last step, we wanted to do a head-to-head Dell P2421 24" vs. HP Z27n G2 comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.