Hey, WH!
What you are describing is also called The Frenzel Method, while the other (akin to "blowing your nose") is referred to as The Valsalva Method. And yes, when you do it you may "hear a roar" in your ears.
Either method is fine. It all depends on which one works the easiest & quickest for YOU.
Some people find they cannot do the Frenzel at all. Others can do either, preferring the Frenzel when their hands are in use for gear, hanging onto the descent line, etc.
In all cases, the main thing about ear clearing is to do it EARLY and OFTEN, BEFORE you feel any discomfort.
After suffering a nasty barotrauma in BOTH ears several years ago, my hyperbaric physician stated that divers should start the equalization process BEFORE THEY EVEN HIT THE WATER. IOW, equalize during equipment assembly, while gearing up, on the surface, and just keep doing it till you hit your desired depth. This way you essentially "warm up" or "stretch" your eustacean tubes before diving, which makes the whole process much easier underwater. Not unlike doing leg stretches before running or bicycling. Same idea.
Following that little piece of advice has made things much easier, even with a hood in cold water.
BTW, another way to help with ear clearing is to descend slowly, feet first.
DSDO,
~SubMariner~