Having both a 2022 MonoMax and MC4, I can say I prefer the MonoMax for almost all beans I've sampled. I know everything involving taste is subjective. Unsure if it comes down to not having an even size of burr between the two grinders, but flat tastes better to me.

It's such a personal decision. I've spent the past year visiting local coffee shops, taking note of the grinders, and trying my best to evaluate the differences between the shots. It's not an A/B comparison because of the different beans, time between shots, and other variables, but to me, there's a definite difference between shots from the two grinders. It's as everyone says: flats bring out more flavors but conicals have more texture. Light-to-medium roasts with conicals lose a tiny bit of the flavor, but make up for it with extra body. To me, that's preferable, and so I prefer conicals. I'd imagine the benefit of conicals would be even more pronounced with the beans you prefer.