I'm not sure how I wound up in this thread, but I just read it because this is a topic that is a friendly point of contention with a friend of mine. For context, he is a fierce advocate of never grinding at all and using careful storage, while I've committed every sin known to stoners concerning grinding and storage. I maintain that the difference is (for the most part) meaningless. The other variables in the equation are much more influential than these.
Since taking up vaping I've been fortunate enough to be involved in a lot of testing. This meant that I had to develop protocols to control as many variables as possible. Turns out that there's a fuckuvalot of them, and some of them can't be controlled. For example, one of these is context: when and where you do it, and what is your state of mind. Because we're dealing with a psychoactive, all of these are important. Your perception of flavour can vary depending on your sinus condition, the other odours in the room, and what you've tasted recently. Directly to the point, the load you use is constantly changing because even if you use the same strain with the same moisture content and handle it exactly the same every time, it's unlikely that you're perfectly consistent with load size and density. Using ground buds helps here because it homogenizes the material, whereas whole buds can come from different parts of the plant or another plant entirely. Then there are the problems of consistent draw, consistent temperature, and consistent vapourizer conditions such as battery strength and whether the heat source is already warm. Don't even get me started on butane heat sources. There's more, but I think I've made my point.
Obviously some of these things matter more than others; however, from session to session the predominance of one over another can and likely will change. If you believe that grinding and storage are always the most influential factors, I won't try to persuade you otherwise although I disagree. I just thought I'd point out the difficulties involved in judging the performance of something that we know alters your perception, and in fact many use it precisely for that reason.