This is literally 90% of why I work so hard to be a writer lol.
But I honestly can't vote on the poll because my stories don't lean in one direction or another. I have some very smart characters, some stories where all the MCs are stupid, and a whole lot of 'normal' people, who make good decisions sometimes, but not so much other times.
If I was just to count my released series, only one of my character's is notably very smart in "Damsel in the Red Dress" that character being "Mrs. Moon." She's an extremely successful business woman who plans her life down to a t, and almost always manages to make those plans actually happen. But the female lead is just normal, she tries to be sensible, but often times emotions, anxiety, depression, etc, all end up being the things that take control in the end, and it's mostly the same with the male lead. He operates much more logically than the female lead, but he's not known for being particularly smart, it's just because his mother is...cough cough Mrs. Moon that he usually ignores his emotions to be sensible instead.
In "Hushabye Prince" both my leads have interests they know a lot about, and are very smart in those arenas, but not so much in others. My FL is a very talented poet and knows a lot about animals, but she's just 'normal' in every other way. She tries to be sensible because she has to be a mature adult, but she's still trying to figure out what she's doing. The male lead realizes he's 'stupid' his own opinion, do to his unique mental state, but he doesn't know that he's exceptional at art. That being said, he's not an art prodigy, the level of skill he has at art is simply what happens when you have no life and paint every single day of your life for 32 years on a set schedule for a minimum of 2 hours. He always follows his emotions rather than logic, it's a trait of his character, and he's not exceptional in most academic regions except language, he learned French easily because he wanted to read "Cinderella" in it's original version, but besides his savantism in language, part of the reason he was home schooled is because he needed a teacher who would be patient with his learning process, which wasn't quick.
Maybe this trait is overused in some genres, I wouldn't know, but in stories catered toward kids, I found that a lot of the child characters AREN'T geniuses, so they often have a learning curve or need help to reach their full potential, be that Ben Ten with Grandpa Max, or in slice of life books like Wonder, where there was a whole lot August didn't know about the world