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3/8" drive is by far the mostly used, followed by 1/4" and then 1/2" not too far behind...but, I feel all 3 are necessary.
1/4" for nuts/bolts ranging from roughly 13mm and smaller.
3/8" for the 10mm to 17mm range.
1/2" for things larger than 17mm.
Things overlap sometimes, and you may find yourself needing the leverage of a larger/longer 1/2" ratchet, with a smaller socket. Things like brakes and suspension work would be examples.
SK makes some really good sets that fall in line between Craftsman and Snapon pricing, yet are really good tools with lifetime warranty. I've had mine for over 20 years and they're still going strong. They're also all 6 point.
Of course, you now also need a good E Torx set and 1/4", 3/8" and 1/2” torque wrench set more than ever before with all of the aluminum and yield to torque bolts used these days.
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