I have a Sharp that some have claimed to have banding and as I am sure you have read many times, despite my looking for banding quiet often, when I first got the set, I have never seen any.
As far as Sharp vs Toshiba the panels seem to be fairly similar to me with perhaps a slight lead going to the Toshiba in terms of black level, but this was never done side by side with the same source so nothing definitive can be said.
You have always had a Toshiba slant and I can understand that as the banding issue was a worry for me when I bought my set, pre-Toshiba days, and I was worried, but it all turned out well.
If I were you I would get the set that you could get the best deal on as you say they both look good to you.