I use unscented everything as perfumes give me headaches. So I always buy the Best Press unscented. It is expensive, so I only use it when working on something I want to be perfect, but I only make an effort to make things perfect on special quilts.
The difference between starching and using Best Press for me is that if I iron startched fabric and stitch up a block, and the grain is off, it is a pain in the old patootie trying to straighten the fabric again. I usually end up throwing it in the washer in a rinse cycle to get rid of the startch and start over again. With Best Press, it is easier to square things up again.
The big problem with Best Press is that it is so expensive.