Alright, I'm trying to wrap my head around this concept for basic machine design.

High TPI results in better mechanical force.

Low stepper speed results in better electro magnetic force.

If you wanted to build a high speed machine which trade off will result in the better net results.

For the sake of this I am assuming accuracy and resolution will be within desired parameters with either build.

Desired results are good strength for roughing out parts, good speed for fast pocketing, the ability to overcome any minor drag or bind points in the machine, and the ability to move a heavy carriage.

Obviously screw and nut types and quality will have a major affect as will the quality of the machine build itself. I'm looking for a general major difference here in the one aspect of the build.