I have done both and after the first try at glue basting, I knew I would never spray baste again. Glue basting is very easy, fast and so cheap. When you glue baste, the hardest part can be squeezing the bottle, but I use both hands with the tip wide open. I also hold the bottle about 12" above the batting, moving back and forth across to create a grid of thin lines 4" apart. This isn't an exact science so if the lines are closer, or a bit farther apart, it isn't a big deal. I don't dilute the glue, I don't put it on with a brush....I try to keep it simple. I have done quilts up to 96" square with the glue method and have had no problems. I air dry the sandwich at least 2 hours, then I feel confident that there will be no shifting....but some iron the glue dry. Of course this is just my experience and personal opinions.