I machine quilt all my baby quilts. Most of the time i end up stippling because i don't have to think about how i want to quilt it. for me figuring how I'm going to quilt it is the hardest part. It takes practice to get good consistant curves and to know where you're going so you don't end up in the corner with nowhere to go.(Don't ask me how i know this). SITD is fairly simple if you can stay in the ditch-i can't seemto. So i use a decorative stitch and sew over the seam. it looks better than my straight stitch and adds another decorative element.
I hope this helps you. Practice is the key.