Been climbing hills since 1990 and one thing I have learnt is that every rider is different. Strongest hill rider I know sits in the saddle and has a far lower cadence than I would ever dream of using. He is an oddball though. I stay seated as far as I can. For hills up to 12% or so- that will be all the way up. More than 12% and I get out of the saddle when the cadence drops below 70. Works for me.
BUT- When I climbed Ventoux- I stayed seated all the way. No section over 12% but it was a bit long. Only thing I did notice was that the cadence towards the top was a lot lower in places.
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How long was I in the army? Five foot seven.
Spike Milligan