I'm also a slow learner (and reader) so I think reading also suits me better because I allows me to control the pace better.
I think mind wandering briefly is a different thing to what's being discussed here though.
Like, let's say I'm watching a video about a complex subject, in my case it's easier to accidentally gloss over knowledge gaps than it is when when reading about it.
It's also feels more practical to take notes or annotate stuff I'm reading about rather than stuff, and it's easier to "revisit" it once recall fails.
It's also generally more convenient to consume (ie I can consume it while commuting/traveling), etc.
However, as a counter point (since I've been doing lots of technical art recently) watching videos on some subjects can be useful, but I still pair it with reading to get a more in-depth understanding on the subjects involved