High current drive means high transconductance and low Vth , for thoses unfamiliar with thoses enginering terms transconductance is the current through the device, a FET, for a given command voltage , while Vth is the command voltage at wich the device start to conduct according to a square law, that is , the current increase as a square of the command voltage, below this level the current through the device will decrease almost exponentialy as the command voltage is reduced but conduction will not be zero when the command voltage reach zero volt, a very low current will still exist through the device , this is called leakage and the lower the Vth the higher the leakage.
Now Vth is inherently a compromise, the lower the Vth the higher the possible frequency but also the leakage, the higher, to some extent, the Vth and the lower the leakage and the frequency capability so this second case is the one wich is relevant for low power devices with lower frequencies, that is what we are used in most conventional PCs CPUs but it happen that 2 cores at frequency 1.25X and voltage Y with a 80% software scaling will outperform a single core at frequency 2X and 1.4Y voltage power efficency wise so the pursuit of the highest frequencies/I drive is somewhat at odd with the current (!) industry trends..