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by avel 1454 days ago
Cost perhaps.
1 comments

Probably under $0.05 difference - but when trying to hit $4 retail every cent matters.
A quick search on the supplier page I happen to have open right now puts the cheapest Micro B connector in stock at around $0.20 and the cheapest C at around $0.40 (both at factory MoQ). So the price difference still appears to be around x2.

A few years ago when I was working on a project, the factor was in low two digits. It was a no-brainer to choose micro B over C.