Drilling down on stablecoins further, this chart shows the average swap value per stable coin on Ethereum.
$DAI is the heavy hitter peaking near $50k/swap in May and averaging 64% more $/swap than $USDT.
$USDT is the choice of small retail accounts averaging only $6.6k/swap.
Checkout the breakdown in the chart below.
It seems that $UST is used by some big fish as well. Average swap value coming in just under that of $DAI but no where near the same volume.