I do this now, too. Several of the instructors on Craftsy classes I have taken addressed SID and recommend doing it this way. I never paid attention to the "lower" side until then. It does look much better and hides the stitching better.

I HATE sitd because it's so difficult to stay right on the seam line so I use the serpentine stitch which is a wavy line and it looks and lays much better and is prettier than sitd.

I don't quilt in the ditch, too hard to stay in the ditch. I stitch about 1/8 -1/4" from the ditch. Looks much neater to me.
Good luck.

Some block patterns really call for SID because it emphasizes the shapes in the block. I'll probably NEVER make a quilt which is "show" quality, so I call my SID "stitch sorta-kinda close to the ditch, but don't obsess over falling in it a couple of times." The quilts will still keep a person warm.

I use a twin needle but don't thread the one going in the seam.

I was taught to stitch right next to the seam, not in it. Like everything else, do what you want to.

I have a Janome and bought a SID foot. I sew slowly and the foot also makes it easy to do. Most of the time I SID.

I use the SITD foot but I offset my needle just one click to the side so I'm stitching NEXT to the ditch. But I wobble and veer so sometimes it IS in the ditch, other times it ends up a little further away than I'd like it.

But my quilts are family gift quilts so I don't fret. Nobody will notice or care if I wobble around. I do practice and try to make each one better than the last but that's more for ME than it is for the recipient of that particular quilt.

To me, stitching in the ditch is stitching right on the seam line. Anything else is top-stitching. And that looks pretty neat, too. If you top-stitch on the "high" side, the side with the seams under, you are making your top much stronger.

Me, too.

So far, Stitch in the Ditch and straight line machine quilting is as good as I've gotten. I try to get "in the ditch" most of the time! Looks like I missed a bit on this one.

Mostly because I have never been very good at "drawing" - - -