The "pure" definitation of stippling and meandering is in the size. Meandering is the larger shapes as shown in most of the examples above. Stippling is the same shapes but much much smaller shapes very packed together.
Many quilters will get a meandering stencil and mark a few times to get the rhythm of the design until it comes naturally to them. Meandering should give the impresson of no specific design but an all over coverage of the quilting
To some the motion comes easy, to others (like me) it is amost like trying to rub your head while rubbing your stomach. I find in class that many students try to create a specific pattern - such as frame but the designs hould move across the surface with no distinct pattern created but just to see an all over background fill.
One problem most have is "backing themselves into a corner" with no place to go especially in triangle areas. there is a good illustration of meandering in triangle areas in the book "Trapunto By Machine" by Hari Walner