"advantageous side" is a correct and usable phrase in written English.
You can use it when you want to refer to a favorable feature of something. For example, you could say, "Investing in mutual funds has its advantageous side, as it can lead to long term financial growth."
Being directed back toward the centre of the flower, the anther deposits pollen on the most advantageous side of the visitor, considering efficiency in reception and deposition.
Senna, smarting from Balestre's decision not to move pole position to the advantageous side of the track and believing there was a conspiracy against him, simply drove into the back of Prost's Ferrari at the first corner at 160mph.
He ends up immediately in the advantageous side control position.
The long delay in production did have the advantageous side effect of allowing Flannery to extend the story, and instead of ending in 1979 it now carried on into the 1990s, bringing the four central characters into middle age.
Obama is in the advantageous position".
This is a potentially advantageous position.
The row erupted because the government has decided there is no need for the usual Whitehall "purdah" – the period before an electoral contest in which the government is not allowed to take actions that could be seen as advantageous to either side.
In contrast to other compounds described previously as dual PI3K/mTOR inhibitors such as BEZ-235, BAY 80-6946 is a selective inhibitor of PI3K, a trait that may be advantageous when potential side effects are considered.
The system was advantageous to both sides and grew rapidly with the expansion of money economy in Europe in the 12th and 13th centuries.
The truce was politically and economically advantageous for both sides, and the Italians were quick to make profitable trade connections in Egypt.
