Machine applique is one of my most favorite things to do, so I would choose that over hand applique any day!
I do use Wonder Under, which is light enough that the quilt still drapes nicely. You really need some kind of paper backed fusible web to press it onto your project before satin stitiching it down. You also need some type of stabilizer on the back to keep the front from puckering. Machine applique will hold up well in the wash.
Amma, your pattern and applique are beautiful!