Every pro in the video you watched
Not saying he doesn't but you said what 6 pros all said Isner? Maybe the top 100 were all asked and they only showed the 6 that said Isner because they had an Isner bias. Maybe 94 said Raonic
Don't believe everything you see
Anyway, I saw several pros saying that Raonic had a better first serve than Isner in their opinion.
I haven't seen the video yet (can't see youtube at work) but when was it made (it has a big influence as in the beginning of 2012, Raonic was stil too recent in many people's eyes to be considered seriously enough) and was Raonic explicitly mentioned in the question or not ?
EDIT : I saw the first video, it was in january 2013 but with only 3 players.