"it is preferred" is correct and can be used in a variety of contexts. You can use it when writing to express that something has been chosen or preferred before something else. For example: "It is preferred that all guests arrive on time to the dinner party."
So it is preferred to NMPC.
It is preferred that the recipient attend this ceremony in person to receive this award.
It is preferred if students already have some background in learning sciences, but not required.
Two parts of Gauss Jordan Elimination are not like Gaussian Elimination's part so it is preferred.
It is preferred by the slow reactions such as the oxidation of hydrocarbons.
It is preferred by some because of speedy drying and matte effects.
So it is preferred to have low energy required enzymatic process to every possible step in the biofuel production.
But even here the opportunity for continuing work and income should be available if it is preferred.
In clinical practice, it is preferred of a sequential design to monitor antitumor activity as well as toxicity.
Because dry forming consumes no water and is less polluting, it is preferred over the wet process.
In addition, it is preferred to be metallic and non-superconducting for better conduction of heat and easy machining.
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Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia