The phrase "are often favoured" is correct and usable in written English.
It can be used to indicate that something is preferred or chosen frequently in a particular context.
Example: "In many cultures, traditional methods of cooking are often favoured over modern techniques."
Alternatives: "are frequently preferred" or "are commonly chosen".
Acoustic warning signals are often favoured over visual ones because they allow the animal the option of remaining hidden.
The new rules state that in the royal enclosure, fascinators - which are often favoured by the Duchess of Cambridge - are no longer deemed acceptable.
Mail-order outlets often dispatch pre-ordered games when they receive them, often before the games are officially on sale, so they are often favoured by gamers seeking to get their latest fix before anyone else.
While at many British vineyards you will see transient workers, agency staff and students picking the grapes each autumn, at Gusbourne, older pickers from the local community are often favoured.
High rise constructions featuring a podium surrounding tower walls are often favoured for the versatile functionality of the building.
Indices are often favoured as they are likely to be less sensitive to changes in solar illumination and atmospheric conditions than individual bands.
"There is a sound reason why [Steinbeck's short novel] is often favoured by English teachers," said Joyce.
Because liquid-cooled in-line engines offered less frontal surface, they were often favoured by military designers.
The afternoon gig is often favoured by old troopers, as if to demonstrate that they've outgrown the evening rat-race.
The Polaroids' white frames give the piece a luminescent framework reminiscent of a stained glass window.Freed from the judgmental eye of the photo developer, and police, the Polaroid was often favoured by those wishing to create intimate or explicit images.
