I would certainly choose the 1913 Liberty Nickel. I have no interest in the earlier coins and the MS70 1909-s vdb, I believe there is no such animal.
The 09-S VDB simply because it's a coin I need to finish a set w/o having to punch out a special spot...
I like the look of the willow tree sixpence, and EF is the sort of grade I lean to. Contrary to the trend in this poll, IMHO the 1913 nickel is a con job, a coin invented to bring a premium as a rarity and nothing more.
I would get the 1913 and sell it on ebay and retire and buy many coins. I think I would take a bath in silver dollars, not in the negative sense.
i'd get the 09S vdb. i've always wanted one, and i know i can get a 1913 nickel. those coins from the 16 and 17 hundreds really don't mean nothing to me.