I can answer that since I've done this exact thing! The led plants will be much better but not because the led is better but because the LEDs give very directional light that Doesent travel far and will not benift the hid plants, but the hid light will benefit all plants.
this is why small led grow tests fail, they do not factor in the fact that multiple hid lamps are better then muli led lamps. And the cost differents puts it out of reason. Get a high dollar digital ballets an all the best reflects/bulbs if you have spare $$$