My personal testing was swapping out crit heaving gear for Det heavy or just crit-less gear in T5

With allagan book and every piece of crit i90 I had I did ~340-350dps pretty often with a crit rate of 25% at best with lows of around 320 and 20% crit rates

With det and critless items (tidal wave book, moogle ribbon and some other changes but all ultimately higher int and magic damage too) I did an average of 320-330 with a high of 344 once. averaged 15-17% crit rates with this equipment. It entirely depends on how often you crit but heavy crits can outdo the sustained damage of det or underperform. Either way you actually need to test in game, not just do the math and run simulations.