What is your day length and growing season?
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A typical onion variety and day length chart would categorize onions as "short-day" (bulbing with 10-12 hours of daylight), "intermediate-day" (bulbing with 12-14 hours of daylight), and "long-day" (bulbing with 14 or more hours of daylight), with specific varieties listed under each category depending on their light requirements for bulb formation; for example, "Vidalia" is a short-day onion, "Yellow Globe" is a long-day onion, and "White Bermuda" could be considered intermediate-day.
Jony's seed chart.
So it is more than just variety and soil type.