Lots of people like both. I prefer reading overall and spend more time doing it. But I also enjoy video games and movies sometimes.
Anecdotally, I've known a number of smart people who aren't big on reading, but I haven't met many people who like to read who aren't fairly smart. I suspect reading helps the brain develop its potential in certain ways, so it may reinforce the intelligence that's already there and possibly strengthen it. Or maybe reading well and nimbly enough to be able to get into prose requires a certain level of intellect to begin with. I think there were some studies a while back that showed that more parts of the brain are active while reading than when watching movies and also that children who read a lot develop empathy faster overall than children who don't (maybe it's the whole getting inside the head of people who aren't you).
Maybe it's upbringing and early environment, but I think there are innate things that play into it also. My parents were both huge readers, as am I, but my brother is not and never has been. He's always been one of those people who would rather be doing something. He's a workaholic who tends to spend even his free time doing active things, and when he has down time, he prefers TV. He gets a lot of his "reading" is via audiobooks during his daily commute.
He's smart, though.
More puzzling to me are people who once read a lot and lost their taste for it. My husband read almost as much as I did when we were first together, but over the years, he does less and less of it, and he pretty much only reads non fiction now (and plays a lot of video games). When I ask him why he doesn't like novels anymore he shrugs and says he's too tired from work, or that all the stories start to feel the same after a while, and the characters just don't feel as real to him as they once did. Conversely, he's also sid he gets annoyed by fiction sometimes because he feels like the writer's trying to manipulate or trick him into feeling something that's not real.
Well, duh. That's the point
I was trying to explain to him yesterday how brilliant I think the author of the book I'm reading right now is. Why? Because she made me cry over the death of a character I didn't even like all that much. I could tell he was wondering why I thought that was a good thing.
He can't really say, though, what's changed in him to make him feel this way. From my perspective, he's the same caring, intelligent, empathetic, and kind person he's always been.