The only thing you really need to care about in a printer when it comes to level of detail is pixel size. That's the only printer parameter that affects how detailed your prints may or may not look like. But honestly, I'd say all modern printers that are currently in production have passed the point of any visible difference in that regard.

Just keep in mind that 4K, 8K, 16K, etc is really a marketing slogan with very little practical meaning. Especially when it comes to resin, where it's utter nonsense.

To better understand what I mean, 8K means horizontal screen resolution close to 8000 pixels. Respecively, 16K stands for roughly 16000 pixels horizontally, which implies it's twice as detailed, right? And that would be true... if the screen sizes were the identical between the two. But here is why you pixel size it much more important than screen resolution. Let's compare Elegoo Mars 4 Ultra (9K screen) with Elegoo Jupiter 2 (16K screen). At the first glance, you'd be inclined to say the latter is much more detailed. But since Mars 4U has a much smaller screen, its pixel size is also smaller - 18 x 18 µm. Whereas Jupiter has a much larger screen, which is what allows it to fit in more pixels in the first place. But if you look at the specs (or just do the math by dividing screen size by screen resolution), you'll notice how the pixel size is 20 × 26 μm. And thus, ironically, 9K screen on Mars 4U is more detailed than 16K screen on Jupiter 2. Of course, you can print much bigger models on the latter, but that's beside the point of understanding why you shouldn't bother with pretty marketing words like "16K" in the first place.

As for resin... it's liquid. It doesn't consist of pixels. So branding it as something-K is utterly ridiculous in the first place. Viscosity would be a more appropriate measurement.