As of today the antminer s21xp is best.
Which is subject to a few things
1) 240 volt single phase power
2) a price of 10 cents per kwatt
you pay $8.50 in power
you earn $15.39
a profit of $7.89 a day
you can buy one at about 6200 usd.
I think the s21xp + takes the lead for now.
500TH compare to 478TH on s21xp
176watt less power consumption compare to s21xp
But they are not really far from each other.
The S23 hydro will take the need soon, with it's 580TH and power consumption same as the s21xp and the +, it will be no brainier.