600 lines is gorgeous in my opinion. It’s my ideal amount and what I have with the 20M2U.
It is a perfect balance of looking a lot like a consumer set but being a little extra sharp and clear. It’s basically a solid middle ground and very well rounded. The scanlines are clearly visible but fade into the overall image and aren’t so “in-yo-face.” And there’s just enough softness to give dithering some element of cohesion, while still being able to see the raw pixel art if you look closely.
the 20L5 in comparison makes each individual pixel so darn separate and distinct that I feel like I might as well be playing on an upscaler. It’s way too clear and pin-sharp. And text ends up looking really funky when there’s no bleeding between rows of pixels. And, quite frankly, 480i is noisier on the 20L5 too because you can see between the rows so much more clearly.