Steam a Seam vs. Wonder Under
 

What is your opinion? Which is best to use for raw edge applique on a quilt?

I use Steam-a-Seam 2. I think that it works very nicely and is very light.

Are you going to be stitching around the edges to secure? if not wonder under is not a good choice. Wonder under is a good choice if you plan on stitching to secure , its lighter and less rigid than steam a seam or even Heat and bond lite.
If you are not planning on stitching to secure , Steam a Seam is better ( but check to make sure you get the right one). It has a better hold than Heat and Bond Heavy.

to me wonder under leaves it stiff, i use steam a seam lite, i don't trust any of it not to be stitched around

I am going to be doing a blanket stitch. I have always used Wonder Under 805 (the lighter one) but have never tried the others. I was wondering if they were lighter. I am making 4 of these Kitty Ballerina quilts for my grandaughters for Christmas and I want something easy since I will be making so many of them at once.

http://quiltbug.com/patterns/ballerina-kitties.htm

I would suggest using MistyFuse and simply doing a straight-stitch close to the edge of the appliques. MistyFuse leaves the applique very, very soft and is unnoticeable. You can Google for more information about it.

The question is rather like asking what's better, milk chocolate or dark chocolate. :) However, I do agree with Prism, Misty Fuse is the sheerest and changes the hand of the fabric least. Here are some comparisons of the types.
http://www.susanbrittingham.com/fusible_web.html

Great info, Thank you!

I glanced over the fusible web website and just wanted to mention that you can add a paper backing to Misty Fuse. Just iron it between two sheets of parchment paper, then peel off one of the sheets.

This is a great thread...I am making a memorial quilt for my husband's niece, her son was KIA in Afghanistan in Sept. 2010. It is a wall hanging--flag with a silhouette of a soldier kneeling at a fallen comrade's grave. I was not looking forward to sewing the silhouette down. Do you think it would be O.K. to fuse it down since it won't be washed often?