macOS handles display scaling differently from Windows, and that single fact decides which monitor you should buy. Apple's rendering looks best at roughly 110 or 220 pixels per inch — near-native or exactly double. Panels that land between those figures need fractional scaling, and text picks up a soft edge that never quite goes away.
That is why a 27-inch 4K panel (about 163 PPI) is a compromise, a 32-inch 4K panel (about 138 PPI) is a different compromise, and a 27-inch 5K panel (218 PPI) is the one that looks flawless. Most people still buy 4K, because 5K costs substantially more.
Beyond sharpness, the practical questions are whether the monitor charges your MacBook over a single cable, whether it has a usable webcam-height stand, and whether the built-in speakers are good enough to skip a desk speaker.