The "correct" answer is to select the gear that best suits your favoured cadence at an output pedal force / crank torque you're comfortable with.
Special circumstances notwithstanding (such as negotiating rough terrain out of the saddle when you want a bit more control through the pedals) the purpose of gears is to allow you to match the changing road speed to your consistant, most comfortable crank speed and torque input.
In practice it's perhaps a bit different as you may not have a low enough gear to maintain ideal cadence at an acceptable load on steeper hills, or you might want to go with a lower than "ideal" gear, get out of the saddle, put in some real effort to attack the hill and grind your way to the top. You might also choose a combination of these over the course of the climb.
The only way you'll know is by getting out there and trying it
Special circumstances notwithstanding (such as negotiating rough terrain out of the saddle when you want a bit more control through the pedals) the purpose of gears is to allow you to match the changing road speed to your consistant, most comfortable crank speed and torque input.
In practice it's perhaps a bit different as you may not have a low enough gear to maintain ideal cadence at an acceptable load on steeper hills, or you might want to go with a lower than "ideal" gear, get out of the saddle, put in some real effort to attack the hill and grind your way to the top. You might also choose a combination of these over the course of the climb.
The only way you'll know is by getting out there and trying it
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