Well Ive owned the S10 Lite and the 7t. And also play CODM. The 7T is the better phone IMHO. The only thing S10 Lite does better is battery life and its just a little better for my everyday use. (Some gaming , heavy web browsing)
Be warned though CODM crashes constantly on my 7T. Tons if complaints about it from other OP users . Rumored to be an Android 10 issue.
I never tried CODM on S10 Lite and Im also very interested in the new Nord.
One last thought.... The difference in gaming power is minimal between the Lite and 7T. Its the SD 855 vs SD 855+.... I doubt you would ever be able to tell the difference.