Is a high-end SSD worth it for a gaming PC?

For gaming, I'd save the money. Once you're using an NVMe SSD, moving from a decent PCIe 3.0 drive to a much faster one usually makes little difference to loading times. The big advertised speed numbers don't translate directly into games loading that much faster.

If the savings help you get a better graphics card or more storage, that's probably a more useful place for them.

There's more to compare than the peak speed, though. TLC drives can generally sustain writes longer than QLC drives, so that distinction matters more if you regularly move or write large files. Check reviews for the specific model and capacity, not just the speed on the box.

For a drive that's mostly holding games, I wouldn't pay a huge premium for that alone. But if a well-reviewed TLC option is close in price to the P3 Plus, it's worth considering.

I'd focus on capacity first. 1TB is a reasonable starting point, but 2TB gives you more room to keep several large games installed. Even 512GB can work if you don't mind uninstalling things, especially with decent internet.

Check how much space your current games and mods use before deciding. A cheaper 2TB drive may be more convenient than a premium 1TB drive for this build.

Don't ignore reliability and warranty just to get the lowest price. Compare reviews and prices for the exact drives you're considering, including the Silicon Power UD90 if it's available. A cheaper option can make sense without assuming every budget SSD is equally good.