Well this is actual racing. Two supercharger kits for the S65 V8 and both with centrifugal blowers. Both have different tunes, different intake manifolds, but roughly the same boost pressure at 6 PSI which will vary with supporting mods (exhaust, manifold, etc) but this is about as close to an apples to apples real world comparison people are going to get.
The first video is an inside view but the single angle does not give a good view of where the other M3 is in relation. It clearly shows the black (Evolve) supercharged M3 in front though. The second video gives a better idea and is an external view although from a distance. The race is close, as it should be, with the Evolve car taking the win, as it should.
Why? The ESS-Tuning kit is Vortech V3si based which is a great blower that offers great peak power. The Evolve Engineering kit uses a Rotrex C-38 based blower with a different impeller design that offers greater mid-range. At 6 psi, the V3si is not at the efficiency range to show its top end CFM airflow advantage over the Rotrex blower. At this power level and boost level, on the stock engine internals, the Rotrex seems to be better matched to the motor offering greater area under the curve. Peak dyno figures do not tell the whole story as the race illustrates.
Additionally, keep in mind there are two skill levels of tuning at work here. The Evolve car is partially designed to showcase the Evolve kit in the United States. Regarding the tuning skill at work, Evolve has shown the ability to improve on ESS tunes. The results linked in the previous sentence are from a third party but show a difference in skill level.
Evolve is based in the UK and has a leg up in that market and more supercharger kits in that market than anyone else. ESS has had their kit on the market in the USA longer. Regardless, sales figures do not equate to performance. They equate to marketing on certain forums. Both are great supercharger kits and the difference in all honesty comes down to a drivers race. How they achieve their performance and what the cars are like to drive including what you get for what you pay should be the deciding factor.
A lot of words for a short simple race video (longer race would be preferred also not on what appeared to be a slick track surface) but when it comes to M3 supercharger kits the cars should really be doing more talking. That has not happened. It's a shame marketing and certain websites that care more about the advertisers do such a disservice to genuine information.
Take a look for yourself.