IDTA and ISTD are more globally known and recognized. DVIDA is generally recognized mainly in the US.
DVIDA lets you take your certification by the dance. So you can get certified in just standard bronze waltz, then later take your certification exam in silver waltz, etc.
From what I've heard, certification in ISTD and IDTA are more thorough and strict, and as such are prized more highly than DVIDA.
Some people get their DVIDA certs first, then get their ISTD or IDTA certification later.
I'm working towards my DVIDA.