I am not able to provide details or comparisons between any motion controllers (that would be a job for the experts) but from the tales of woe, here on the forum, it would be best to avoid any of the cheap Chinese stuff and stick with EU or USA manufactured products.
For laser use there are some special Gcode commands which, for speed of operation, are linked to axis movement (M11Px, M10Px for Mach3 and M62Px, M63Px for Mach4) and only a motion controller that fully supports these commands should be selected.
Hope this helps,
Tweakie.