What about ANTUTU Benchmark ? ANTUTU scored 236919 on Pixel 3 XL. Huawei Mate 20 Pro scores 273233.
When it comes to ANTUTU, the Huawei Mate 20 Pro is 15.3% faster than the Pixel 3 XL. Huawei wins in all CPU, UX and MEM performance except GPU which it lost to Pixel 3 XL.
So, if you do a lot of web browsing, the user experience will be smoother on the Pixel 3 XL.