Stepper vs. Servo

Anyone build a gantry flame cutter?

How do you deal with arcs and corners?

Do you use constant feeds or varying feeds?

I'm building a large gantry flame cutter. The work envelope is approx.
65"x65".I've tried 5A camtronics drives and achieved 1000ipm rapids
with 150oz/in nema 34 motors. Feeded moves below 100ipm become very
cogy, and create excessive vibration. Tried gecko g201, and got
1000ipm rapids and very smooth feeded moves down to 10ipm.

I've got dozens of various nema 23,34 motors from 50oz/in to 450oz/in.
Assuming I settle on an approprite sized motor, and can assume that
lost steps will not be a problem.

What would be the advantage of using servos and gecko 320/340s?

Doug