Qualcomm and Windows OEMs continually advertise Snapdragon X Elite laptops as being MacBook Air beaters. However, it seems that many popular options like the Surface Laptop 7, Surface Pro 11 and Dell XPS 13 9345 cannot currently output at 4K and 120 Hz simultaneously on an external monitor.https://www.notebookcheck.net/Qualcomm-s-Snapdragon-X-Elite-laptops-have-a-dirty-secret-when-it-comes-to-external-monitor-support.896451.0.html
It's not about the DP or the HDMI version, it's about the outdated display engine of those Adreno iGPUs.