This is a question that I've struggled with in the past, and actually am currently struggling with personally right now.
You have a few hours in the evening after your kids are in bed. Do you plop down in front of a video game or do you grab a solo board game? I think the answer for me is both, at least at different times and when I'm in different moods.
Solo board gaming is incredibly rewarding but also takes a ton of brain space. Lately work has been so busy for me that I just haven't had the space to play some of my favorite board games. Fortunately for these times I have my old flame video games to help give me some distraction and mental space. Video games run their own AI and allow immersion more easily. But they lack the tactility and satisfying feels of board games.
So I say both! And if all things were equal in a vacuum (which is impossible) I would lean toward solo gaming.
So I'm basically not answering my own question. But perhaps one of you can give a more definitive answer? Which do you prefer and why?