Both quilts are cute!. I think stitch in the ditch is a good starting point for machine quilting. You'll be surprised at just how difficult it is to wrestle the quilt sandwich through the throat of your machine. Another option is to tie the quilt together. I've never hand quilted, so can't comment on that.
I think I'd tie the quilts since it's so close to Christmas and then, if you want and the proud owners will part with the quilts, quilt the snowflakes later.