"which works better" is correct and usable in written English.
It is typically used as a clause in a sentence to compare two or more things and indicate which one is better. For example: "I'm trying to decide between these two laptops, but I'm not sure which works better for my needs."
87% of the farms are privately owned, which works better than collectivization.
There will be further opportunities for alternative and traditional banks to work together and build a financial framework which works better for customers.
The City will now benefit from a controlled experiment to see which works better: the mean bird or the happy hen approach.
He eventually arrived at the current version, he said, which works better because it is more comfortable and has a slightly more familiar shape.
"Comparative effectiveness" studies, which compare one treatment for a particular illness against another to determine which works better, have received a lot of attention and billions of dollars in federal support in the last few years.
Tinariwen's new album, "Emmaar," is its best-engineered yet; previously the members have recorded outside — where they prefer to sleep — which worked better than you'd imagine.
In the end, I did it in a huge room in the Barbican, which worked better because it was more, um, mature, but then there's more pressure.
These lessons include highlighting key messages and actions required, presenting information more effectively, and exploring different types of communication to see which worked better.
Last year the Oscar ceremony, which was produced by Mr. Mischer and Bruce Cohen, made a bow in that direction with a series of digital ploys and backstage encounters, some of which worked better than others.
Written in short scenes – which worked better technically in a subsequent television version – it was by turns tender and very funny, with a memorable diatribe from the drifter Stella, corrosively describing the men encountered in her one-night stands.
