It really just depends. You want to do your final stitching on the front. That's what's most important. Also, I'd recommend using bias binding & making it 2.5" instead of the standard 2" width both for durability and to help accommodate the stretch of the minky back.
When you do the initial stitching on the front & then SID on front like Nancy Zieman recommends, your stitches are hidden in the ditch on the front. That works well as long as your binding is slightly longer in the back than on the front. I did that on my avatar quilt (McCall's); the front is 1/4" and the back is 1/2", according to the pattern instructions. From the front, it is a beautiful invisible stitch -- or you could use a decorative stitch along that same seam & that also looks nice. It can get a little bit tricky because you can't see where your binding is to ensure it's covering the original stitching line and is perfectly straight, but I did it as a beginner and it wasn't bad. Just use plenty of clips/pins.
Here's Nancy Zieman's tutorial:
http://www.nancyzieman.com/blog/quic...s-for-success/
Other quilters prefer to do the initial stitching on the back & then pull to the front & stitch. This method is easier if you made your binding the same width front & back. If you plan to do a decorative stitch, this can look especially nice. With a straight stitch, it means you have that tiny folded edge to the inside of your stitching line. You also need to make sure that your binding is long enough to cover over the stitching line from where you attached it on the back. Leah Day references this in her binding videos.
Straight Stitch:
https://www.youtube.com/watch?v=85MWLgG172k
Buttonhole Stitch:
https://www.youtube.com/watch?v=wprg5vzkuGw
Hope that helps!