'main distinctions' is correct and usable in written English.
You can use it when you want to emphasize that there are specific differences between two or more things. For example, "The main distinctions between Romantic and Naturalist literature are the themes and settings."
Exact(14)
Their main distinctions seem to be that one is single and childless, one is divorced with children and one is married with children.
Rhyme is used in all kinds of Persian poetry, but its distribution provides one of the main distinctions for the poetic forms.
But most observers expect him to tone down military talk as prime minister and turn instead to economic populism to appeal to a broad range of voters.Mr Ishihara draws three main distinctions between his own economic approach and Mr Koizumi's.
The main distinctions of our proposed subjective evaluation method are the following.
Two main distinctions fall into this family: universality/non-universality and generality/non-generality. Agent-neutrality is often confused with universality.
Based on a review of the existing definitions of security and safety, this paper identifies the main distinctions between the two notions.
Similar(45)
For Roberts, the main distinction is between activity and inactivity.
They argued that the main distinction between terminal sedation and euthanasia was time.
But the reality is that that is the main distinction between the killers and the killees.
The main distinction is between what feels alive and what does not.
Its main distinction is that it is set in a post-O.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com