Explicit Supply vs. VST

[Zoetermeer]

I've read in a few places that "experienced players" tend to prefer VST, but for me personally being fascinated with the logistical aspects of the Eastern campaign I like the idea of on-map, explicit supply better.  Why is it that people tend to prefer VST?  I have only ever played with explicit.

Some of the campaign games ship with VST turned on by default, but I wasn't able to really find a compelling reason why the developers prefer that over explicit either.