Image from the Library of Congress
I've tried both approaches and I find peace of mind in knowing that my gowns' seams have knots for, from my experience, the basting stitches do not hold as well. I'd rather knot (haha...bad pun I know) spend time mending those seams when I can sew / research other projects. (When embroidering, I also favor knotting even though--I know--it's not advised.)
Do you knot or not?