Have been observing this from sometime.
I found YT shorts algo simply BS. I get same content over and over in my feed for at least a week and then this would repeat for the next set, the exact same set of 20-30 videos, it feels like that’s all they have.
This happened to me when I turned off my watch history for privacy reasons. I was tired of being shown the same videos again and again, and had to turn on watch history.
Shouldn’t it be still optimised? There are 1000s of videos which it would want to show to me, may be a bit of randomisation.
Both are tailored towards getting you hooked into them. “Better” is for the companies, “worse” is the correct terminology for you (the consumer).
Kinda hard to judge because there's lot of subjectivity and no single evaluation metric that can be easily and automatically computed across the platforms. So the best one is whichever platform personalization work better for you (at least at present).