Buy crypto with fiat or stablecoins? What's better?

Hey

If you deposit fiat into Binance, is it better to directly buy your crypto with that fiat or to first convert the fiat to a stablecoin and then convert that to crypto?

A lot of people seem to recommend to always convert your fiat to stablecoins. But, Binance takes a cut each trade/conversion so if you first convert your fiat to stablecoins, then from stablecoins to crypto then that's 2 trades instead of 1 if you go from fiat to crypto directly. So shouldn't going the stablecoin route be more costly in terms of fees?