In the video it's all on open dual carriageway, just where a valver can really stretch it's legs and get at all that extra high revving power over the 8v, in standard trim the valver got an extra 10mph top speed and so should have been going away from you !?! Being that close I can only assume that either your 8v is not standard or your mates 16v is not in the best state of tune.
Did you also get to get to go head to head on slower roads, and also off the lights as most of the 16v owners on this site seem to think a valver is a good second quicker to 60mph, even though the vw figures quotes 8.3 and 7.9 respectively??