As per this reddit guy I quoted earlier, I suspect whether it's the S, P or U series, as long as it's a -24 (i.e., S2724 or P2724 or U2724) or later model, much of the flickering is gone.
The P-series usually gets you a panel with better uniformity and less bleed. It's not something they list in the spec sheet. P-series also get standard 3-year warranty, higher USB-C PD rating, and a couple cm of height adjustment (better stand).