"but another advantage" is correct and usable in written English.
You can use it to introduce an additional advantage or benefit when comparing two ideas or concepts. For example: "Living in the city has its advantages, but another advantage is being close to public transportation."
Mirrors, she said, can be as eye-catching as art, but with another advantage: "Adding a mirror is like adding a window to a room.
But microfilm offers another advantage.
The neighborhood appealed to her because her friends tended to live there, but it had another advantage too: she knew her parents would never follow her there.
This plan may be radical, but it has another advantage over contraction: If baseball had decided to eliminate some teams in the 1980's, Atlanta and Seattle, two of the worst, might have gone.
The 1987 Wimbledon champion Pat Cash was one of those surprised by the news, but points to another advantage of employing such a classy grass court player.
But there is another advantage as well, he noted: "Parks that are the foci for research tend to be better protected.
I've emphasized the importance of collecting information, but there's another advantage: You're establishing a network of people who know you and who know you're serious about your professional future.
But Snow has another advantage, and I suspect the big boys in New York are well aware of how important it is -- she's a mother.
Last but not least, another advantage of TMA is cost and time savings.
Our study of these interactions not only demonstrated differences between the species tested but also showed another advantage of such a comparative approach: the S. pneumoniae YjeE as well as the the S. aureus YgjD protein autoactivated the reporter genes when fused to the Gal4 DNA binding domain.
