The main goal is to find some cherry blossoms in bloom somewhere. I just can't tell if it's really necessary to "chase the blossom".

We really don't have a preference as to which way to start and which to end. I've seen itineraries for each way and some people seem to care. Was just hoping others commented as to whether they thought it really mattered or not. Because if it does matter (much better chance of seeing cherry blossoms, some other reason I'm not aware of, etc), I'm willing to go through the hassle of flying into Osaka. If there isn't, like most seem to say, I'll just start in Tokyo.