It turns out that Ice Lake laptops are better for eGPU gaming than their more powerful Comet Lake-H counterparts, Jarrod's Tech has discovered. Thunderbolt 3 controller placement seems to be at the heart of the difference in performance, which can be nearly 50% in some modern triple-A games. Seemingly, Thunderbolt 3 latency matters more in eGPU gaming than high clock speeds or a superior TDP.
https://www.notebookcheck.net/eGPU-gaming-Ice-Lake-U-processors-offer-nearly-50-better-performance-in-some-games-than-Comet-Lake-H-processors-do.498840.0.html