Help me choose my first spindle

[magicniner]

3. Speed control, not sure what a VFD is some kind of power inverter I assume that performs PWM but what's the difference between a VFD and a spindle that supports PWM through Mach 3 (With appropriate circuitry)?

A Variable Frequency Drive (VFD) takes the input power, rectifies it (sometimes transforming voltage first) and then uses electronics and big capacitors to chop up the DC and feed it out in little pulses which with the aid of the smoothing capacitors approximates 3 phase well enough that the induction motor doesn't know any different .
PWM works for permanent magnet and universal 3 phase mains motors and also for DC motors, any power tool with a knob for varying the speed is likely to be using PWM.