Giraud Tri Way in a corded variable speed drill running fast is what I use.
Giraud complete if money is no object.
Hard to beat the Giraud.
I love the tri-ways, they work great for me.
Caution however .... with any of these drill mounted or machine driven trimmers that you manually feed with brass, your hands are the weak point. Part of the key IMO is to make sure you are running the Giraud fast enough (if providing your own power), and letting the blade do the work. You shouldn't have to force or death grip anything .... but even remembering that, I typically don't run more than 300-500 per session/day depending on how much is being cut, or my fingers will get sore. I don't need to solve for that, I can stay ahead of my shooting at this pace.
Only reason I mentioned this is because the OP was looking for some hand relief. I still recommend either of the Giraud trimmers, but to be fair, this may not solve the OP's hand fatigue.