The difference is that you're biking down a lowish traffic 2 lane highway where people have plenty of room to pull into the other lane. Being bright annoying and hard to figure out where you are works effectively (though annoyingly) when cars have plenty of room to get around you because they pull into the other lane.

When there is no other lane to pull into, this tactic isn't nearly as effective, because the cars behind you don't have anywhere else to do so they generally just pass you anyways. And since they don't know exactly where you are, well they aren't going to risk hitting another car headon over it, they just pull past you - something from your videos that you also do not appear to have to deal with as you appear to ride on either a 6 foot wide shoulder or on a road with no shoulder in which case you have to take the lane.

I simply prefer one steady, one flashing. When cars are going to be trying to skim by besides me anyways, which are they are going to do on a 2 lane road, I'd prefer they know where I am and not leave them guessing. I'm sure either one will work though, and either approach is better than not realizing that one of your rear blinkies went out and you don't have any light behind you.