Having smoked both, I can't think of a single reason to ever purchase another ESG, given the price point.
If someone handed me either stick for FREE, I'd still probably take the VSG. While neither stick has the complexity of a Nic puro, I like the blend of the VSG a bit more.
http://www.ashtoncigar.com/Ashton-VSG.jsp
http://www.ashtoncigar.com/Ashton-ESG.jsp
I also echo Addiction's opinion... The San Cristobal is probably their best stick, and usually a few bucks cheaper than the VSG. DEFINITELY dollars cheaper than the ESG