Humidification beads: RH60, RH65 or RH70?

I have searched through a lot of posting for beads and and haven't found the answer for a question I have. Why have different RH Beads? Is the different RH in the beads determined by the RH of the area you live, or the preference of what you like your Cigars being stored at? I have a medium size humidor and need a larger one and am now thinking I would like to use beads instead of a active humidifier. The RH in my area"Victoria BC Canada" is relatively high, ranging from 60 to 80 plus, with weeks of highs in the 90's and lows in the 50's. Temperature ranges on an average between 12 and 20 degrees Celsius, with lows of 0 for a few weeks to highs of 28 for a few weeks. Does my RH and temperature dictate which beads to purchase or is it a personal preference.