The slowest Tiger Lake Core i7 laptop can have up to 45 percent slower graphics performance than the fastest Tiger Lake Core i7 laptop each with the same Iris Xe GPU. If you're aiming for faster-than-average models, then our compiled list should be of some use.
https://www.notebookcheck.net/We-ran-3DMark-on-over-40-different-11th-gen-Core-i7-Iris-Xe-laptops-These-are-the-slowest-and-fastest-models-you-can-buy.540278.0.html
I believe from eGPU usage PoV it's all about stable long term turbobust performance and i5 could be better.
🤦🏻♂️ But the same article should also compare CPU performance for those same laptops side-by-side
Very handy, thanks!