Spray baste will let you reposition the fabric and it washes out when you wash a quilt . Spray adhesive for anything except specifically for basting, is much stronger, so you would have a very hard time repositioning anything, and it doesn't come out in the wash.
Spray baste is expensive, but makes sandwiching I don't despise anymore. I hated pins and thread basting--too hard to undo mistakes in positioning. Too time consuming. Harder on the fingers. Had to watch not to hit one with the needle when quilting.
I use my coupons on spray baste and I also use less than the directions say (obviously the manufacturer wants you to have to buy it again sooner). Works fine.