usually preferred by Gmat?
that red thing...
...is not a thing.
THERE IS NO SUCH THING AS 'PREFERRED'.EVERYTHING that's tested in SC will be either...
...1/
correct vs. incorrector...
...2/
objectively superior vs. objectively inferior.
#1 needs no explanation, of course.
#2 covers things like parallelism, modifier placement, wordiness/efficiency, etc. note that these are
NOT arbitrary 'preferences'; they are
OBJECTIVE judgments. (these things are
objectively more parallel than those things... this phrase is
objectively more wordy / less efficient than that one ... etc.)
(also, there's the simple reality of the test: this is a very high-stakes exam that must be administered
without controversy to hundreds of thousands of highly competitive professional students per year. needless to say, if any of the problems relied on 'preferences'... the test would fail badly at that job.)
if you think SC involves 'preferences', you're introducing complexity where none actually exists. don't.
keep simple things simple!