I think current AMD Zen offerings are faster single thread clock-for-clock for scalar code than anything Intel has to offer. OTOH, AVX2 peak rate is lower for

I think current AMD Zen offerings are faster single thread clock-for-clock for scalar code than anything Intel has to offer. OTOH, AVX2 peak rate is lower for Zen than recent Intel offerings. Javascript is very likely to be scalar bound, so I think you might currently find the best performance from AMD camp.