At work I use opus max Fast
It hardy ever fails for no reason even if I forget to give it all the right context.
At home i run sonnet, and it does not get what I meant or expected 20-35% of the time.
Due to the enormous difference in cost, depending on the value of your time (hourly rate) that might be a nett benefit.
Sonnet being faster alone would not be worth the failure rate for me.
At home i just not want to pay more than 20 bucks for incidental projects.
And opus max would just consume my tokens in one round.