I like a good mechanical fan with a clutch in a properly built shroud. Each of my old vehicles has some part of this, none have all, but that would be ideal in my world. But then again where I live it rarely hits 80 in the summer and rarely drops below 40 in winter. I don't like flex fans, they're too noisy among other complaints. A mechanical fan with a clutch will release at rpms where ther is plenty of airflow through the radiator, yet lock up at low speeds in town. Coupled with a good shroud, I can't think of a better way to do it.
Devin