The GNU C++ options available on Codeforces are:
GNU G++11 5.1.0
GNU G++14 6.4.0
GNU G++17 7.3.0
GNU G++17 9.2.0 (64 bit, msys 2)
The features in the newer C++ standards don't seem to matter for a competitive programmer but what does matter is whether the solution fits in the time limit. The variation in the running times can be over 50% for the exact same code and there is no option that always beats the others. Basically we have a rock paper scissors scenario.
If you average over say 50 rounds does any option perform better? Has anyone performed this kind of analysis?