Confused....DV vs. MOV

[H_you]

What's the difference between the two? Is one better to use than the other? Different situations? Can anyone give me case in point or experiences from trying both?

[Burned2manybridgesB4]

FDCPA 809 covers DV's that are standard in nature, and within the 30 day initial contact from the CA, to the consumer.

FCRA 623 (a)(8) covers direct disputes, and their impact of directly disputing information provided by the furnisher.