Dual 3090 >>> Any Apple product.
Both machines will be stuck in the 30-50GB model range, but the 3090 would have faster token prefill and faster decode speeds (614GB/s on M5 Max vs 936GB/s on 1x 3090).
That is not true.
3090 is only 24GB.
It will absolutely outperform the M5 on models that will fit in that space, but M5 will outperform with larger models as the whole 128GB is GPU addressable.
Dual 3090s are terrible airpods