Almost all of our OEM clients (OK, customers) use switching power supplies. The parity or break even point between iron supplies (xformer, rectifier and bulk capacitor) and switchers was passed a few years ago. Almost everyone uses switchers now.
There are a few things to take into account when using switchers with motor drives. Switchers work at high frequencies (40kHz or higher) and have tiny output filter capacitors. Motor drives need big capacitors because a lot of energy moves between the drive and power supply.
You need to put 10,000uF on the switcher output VDC for step motor drives and at least 30,000uF if you are using servomotors. They form the very necessary "flywheels" on the source supply.
Avoid sophisticated supplies with overvoltage crowbar protection. The power supply "sees" more voltage on the output than it should and it shuts down. The voltage came from a regenerating drive (decelerating) and it fools a sophisticated power supply into thinking something is wrong.
If you use an overvoltage protected supply, decouple it with a rectifier diode going to your external 10,000uF or 30,000uF capacitor. This makes the even most persnickety switching power supply behave like a *****cat.