I've never had to perform either in a game before, but I think that Queen vs Rook seems to be a lot harder to manage.
The Bishop and Knight mate involves almost zero counterplay from the opposing side because it's just the king, so all you have to do is memorize a few patterns and you're good to go.
On the other hand, a Queen vs Rook endgame has plenty of ways to go sideways because the rook's existence gives the opposing side a lot of defensive and counterattacking options, so you have to be much more careful.
Do you think your blog is coming in 48h? Because I really hope so