I very rarely tie a quilt and SID - it is either or - but I have done both when the ties are going to be too far apart. And I have one quilt that I tied in 1992 which is still in use today and it has held up the entire time. I wanted it extra fluffy so used 2 layers of batting and the ties are 10 inches apart - because I didn't know any better at the time. So do what you think looks best to you.