Video Player Ad Interface Definition VPAID tags build on the functions of VAST they make the ad interactive and add metrics. However, there is a giant caveat: sewing is not an option here. This could pose huge problems because you will have to find a detour around all the pre rolls that are currently being offered in Europe. Still, most likely the upside is greater with this technique because it gives better insights and metrics in terms of viewability and might even offer some interactivity. Therefore, if sewing is not a deal breaker for you, this can be the best choice among all other tags.