hi

If you have products of dia 400mm bringing the dia back to 80mm over a length of 900mm ,then G97 is the better choice.
but on normal steel products of <40mm the needed cutting speed often exeeds the max rpm of the machine.
high feeds is the magic word, not high rpm's .
If you look at the numbers and the electric bill ,the acc/decceleration of the chuck is not per definition the best option.

but for every job it's own best way

Attachment 214740

vr gr bertus