Vega 8 vs Xe comparison.
Look at the CPU clock speed, power, and GPU clock speed results. AMD's GPU clocks are very stable, and CPU clocks are very low, generally under 2GHz.
Intel's CPUs go often over 3GHz, and some reach 4GHz! You can see comparing the power meter where the Intel setup uses more power is generally where the CPU clock frequency is high.
Also where it performs lower is when the iGPU is clocked low at 1-1.1GHz range, rather than 1.3GHz it's supposed to. Whereas on AMD the GPU clocks are very stable.
So this is the traditional Intel iGPU issue where it's prioritizing the CPU over the iGPU so it steals the power available and doesn't perform as well in games. Also Zen mobile has a very efficient CPU architecture. Running Tigerlake at 4GHz of course doesn't help.