I love engine theory! This is a very well done video and his accent makes him sound much smarter also!

It explains very well the differences and yes you can see why cam timing needs vary a little where one works better at higher RPM and one better at low RPM... I would like to find some dyno tests of very dramatically different engines but I have only ever seen slightly different combos and of course the improvements are only very slight also and hard to infer much from the results. 1/4 inch either way seems to make very little difference but an inch or two different would not be practical in most if any engine. Bottom line I wouldn't worry much about it as long as I am within generally acceptable norms.