I have used both. Both are superior products. I prefer the carnauba richness that one gets with Poorboy's EX. Both are extremely easy and a pleasure to use. Also EX tends not to hold a film after rains. :bounce Great for black cars that are driven in all types of weather.
These are my results and yours may differ depending on quality of prep, detailing between washes, frequency of waxing, area where parked ( physician parking lot is dust/dirt free an no trees (sap), amount of time spent exposured ( garaged 15-16 hrs/day)and type of rain in your area ( low acidic rain here). :wavey
VM and GEPC/SEPC are just ultra-fine finishing polishes (cleanser) and just eliminate the very minor surface marring which enhances gloss and surface smoothness. Excellent easy to use adjuncts to sealants/waxes. :xyxthumbs