Section a is more appropriate for a résumé.
Here's why:
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Clarity and Readability: Listing each achievement or responsibility on a separate line (as in section a) makes it easier for potential employers to read and quickly understand your experience and skills.
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Professional Tone: Each point in section a is presented in a complete sentence format which conveys professionalism. Section b, while concise, comes off as a run-on sentence and lacks the polished structure typically expected in a résumé.
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Impact: Section a allows for better emphasis on each individual item. By separating them, you give each bullet point its own space and importance, which can help draw attention to significant achievements.
In summary, section a is the clearer and more professional choice for a résumé.