I actually still prefer SO as I get to see different solutions to the same problem and related discussion. Co-pilot is great for boilerplate stuff though, which is the majority of lines for most projects these days I'd guess.
If you like seeing options, you might be interested in having the Copilot pane open while you code if you are using it. It shows usually about 4 solutions in the panel that it is thinking about for autocomplete, and you can click which one you want.
Not necessarily better than SO but I find it nice to see options.
