Machiavelli's The Prince has this famous quote "Its better to be feared than loved, if you cannot be both."
Respect is internally based. It's a feeling you largely choose to feel, that you can large turn on and off easily. Respect is fickle. It comes, it goes, all it takes is one small rumor and all the respect is gone.
Power is much more predictable and largely externally based. People who respect you can fall out easily on a fast downward spiral whim; power does not wear off if your base character stays the same.
But note the "if you can not be both." The highest way is to be held in love, esteem, and respect during daily life, with something in the back of a person's mind that if they do wrong by you, you'll be a source of hell and misery. That keeps wanton destruction and arbitrary betrayals in check.
So I'd go with Unlimited Power over unlimited respect.