Plug equipment into a surge protector because that will take most of the spike of electricity. The plugging everything via USB will be okay if it is connected to a surge protector. Turning off the equipment when not in use will only make the battery live longer if it gets spiked while it is off it will still be messed up. Recharging equipment is only good for when you don't have any power and need to use this certain device. So now that i have gone over all of the options it should be clear that plugging your electronics into a surge protector is best out of all of the options.
