Neither of those are it, the West Indies doesn't have a flag because it is made up of individual nations, does anyone know their geography?!?!?
The first one if you saw the picture name is a fake, a variation of the West Indies Cricket Board logo, and the second one is the Antiguan flag. The West Indies is the Carribean, the Carribean doesn't have an official flag.
In my opinion you should use this one, it's the most official flag of the West Indies there is: