Why does Galaxy Nexus i9250 official car charger have 700mA instead of 1000mA?
It shouldn't matter which one you get, because the internal charging chip "should" control the maximum charging current. So unless you're planning to use your charger with another device that can charge at a higher current, you're wasting your money (unless they cost the same.) If for some reason, like custom ROM or poor firmware, the charging chip is not operating right, you risk burning the vias on the PCB.