using resistor instead of current source in mixer's differential pair

Hello, friends)
What are pro and con of using resistor instead of current source in differential pair of Gilbert-type mixer ?
Thanks for advance

If you use Resistor, the current won't be constant enough, this will change the OP of the mixer..
Current Mirror is better but it's little bit noisy because it amplifies the noise coming from the reference current source.

Thanks for you reply)
So you mean that there would be additional power consumption, especially at large input signal, as i understand. That's not a big penalty.