The phrase "prefer this over" is correct and usable in written English.
It is used to express which of two or more options someone prefers. For example, "I prefer this over that option."
I prefer this over the far more expensive Sena Folio, but I'm still not loving the attachment method.
We found people prefer this over online payments because it only took a few seconds to make an easy (and secure) payment through a text message.
Mail lets me view my CG e-mail as I would on my desktop (I prefer this over BB e-mail bc I like to star and spam my e-mails), but the only thing missing was the ability to view and edit my Google Calendar.
I prefer this over being subdued.
You can also make a little tuna fish salad, as some guests will prefer this over the traditional lox.
Again, ask before putting your health at risk but where the opportunity exists to drink healthy water from the tap, prefer this over bottled water.
We preferred this over invoking a response from the virtual instance as this would add more chances for failure.
The consistent message is that while higher proportions of the British public are prepared to accept nuclear power if they believe it contributes to climate change mitigation, this is a highly conditional view, with very few actively preferring this over renewable sources given the choice.
We preferred this over the HDAC1/2 knock down experiment because knock down of HDACs is likely to be partial, and we are not sure how we would interpret a negative result.
Our consumers have told us that they prefer this size over the larger size because the majority of our Baker's recipes call for four ounces or less.
In many ways, I prefer this dish over the traditional version as it allows for much better appreciation of both fantastic British lamb and nutmeg-scented spinach.
