It looks like you've received opposing pros and cons for every situation. I've found that quilting (I always hand-quilt) is always easier when seams are all pressed one direction; then I quilt on the opposite side of the seam: one less layer of fabric you have to sew through.
In order to do this, I recently made a disappointing mistake. I almost always press fabrics to dark side, but so I wouldn't have so much bulk to quilt through, I pressed some long seams to the light side. Would have been o.k., but it was medium blue against an off-white block, and my blue seams were just slightly wider than the off-white. Result: I have a dainty blue edge on that light seam that shows through! Live and learn! :x