What is wrong with this sentence?
Rotary sidewall coring is more expensive compared to percussion sidewall coring methods.
The first thing wrong with it was covered recently in Tip #153, where we learned that “compared with” is used for contrasting, whereas “compared to” is used for “likened to.”
The second thing wrong with it is the wordiness and redundancy of “more … compared to.” The concept of “more” already embodies the idea of a comparison, and so the correct expression would be “more … than.”
Rotary sidewall coring is more expensive than percussion sidewall coring methods.
The same rule applies to expressions where something is less, rather than more.
This sugar-free fudge has less calories compared to my mother’s fudge recipe.
To correct this, first we must remember (Tip #20) that we use “fewer,” not “less” for countable items. Second, the word “less” already states a comparison, so “compared to” is redundant, not to mention wrong due to the fact that we are contrasting. Thus, the correct sentence should read:
This sugar-free fudge has fewer calories than my mother’s fudge recipe.
But it just doesn’t taste the same!