switched mode vs. linear:
SMPS have high efficiency (low loss), but are comparatively noisy.
Linear regulators have low efficiency (high loss), but cqn be very silent (low noise).
Regulated vs. unregulated:
What's the question? It is obvious, isn't it?
If you need a precise voltage, you regulate. If your requirements with respect to voltage regulatioon are low, you can use an unregulated supply. For a motor you don't need a regulated supply - unless it is explicitely stated by the manufacturer (e.e. if the motor is electronically commutated, also called brushless. But that's another story).
Read this overview.