The phrase "a main distinction between" is correct and usable in written English.
You can use it when discussing differences or contrasts between two or more subjects or concepts.
Example: "A main distinction between classical and modern art is the approach to representation and abstraction."
Alternatives: "a key difference between" or "a primary distinction between".
A main distinction between the two attention views was their prediction on the extent that graded performance tradeoff was possible with graded priority changes.
Mr. Romney has seized on those remarks as a main distinction between the two men, but he has devoted more time to criticizing Mr. Perry's statements than to outlining his own ideas for the program.
A main distinction between these classes is whether H3K4me2 is localized around the transcription start site or to a larger degree spread throughout the gene body.
These differences could be explained by differences in the features of the external representations, given the observation above that the representation of movement is a main distinction between the tangible model and the image.
A main distinction is drawn between the systemic and the dialogical approach to research.
A main distinction has been proposed between voluntary and automatic mechanisms underlying temporal orienting (TO) of selective attention.
Regarding the use of bibliometrics, a main distinction can be made between informing peer review with bibliometrics (category A) and direct use of bibliometrics in the formula (categories B and C).
Following the Cochrane Handbook ([7], section 5.3), a main distinction can be drawn between inactive and active control-group designs.
The main distinction between study A and study B was the inclusion of 10 mildly asthmatic subjects in study A. The number of exposures with complete Holter data in each exposure category was as follows: 53 exposures to CAPs; 53 exposures to CAPs + O3; 40 exposures to O3; and 42 exposures to FA (sham).
