The performance is basically neck and neck (GCC can be measured to be faster at a few SPEC benchmarks, but they can be contrived and the kernel is often hyper-optimized so the difference may not be down to the optimizer).
GCC in this case gives you equal or as-near-as-makes-no-difference up or down performance in less compilation.
Some rigs are now posting 17s Kernel build times, reasons to be cheerful
GCC in this case gives you equal or as-near-as-makes-no-difference up or down performance in less compilation.
Some rigs are now posting 17s Kernel build times, reasons to be cheerful