I once asked my friend and fellow GMG member Christo the same question in 2007. This is what he answered (and I translate from the Dutch):
"Both cycles are good. My personal favourites:
First: ?, Second: Volmer Third: Järvi, Fourth: Järvi, Fifth: Volmer, Sixth: Järvi, Seventh: Volmer, Eighth: Volmer, Ninth: Volmer, Tenth: Järvi, Eleventh: Volmer (Järvi never recorded this, though he once gave it in Amsterdam). Volmer is less impetuous than Järvi, and that pays off in, especially, the Seventh, Eighth and Ninth, but Järvi has more passion, which gives his readings of the Fourth, Sixth and Tenth more power.
In short: both Järvi and Volmer are excellent. You can't go wrong with either of them."