4 dofs or 6 dofs robotic arm, which is more common?

My friend and me are arguing which kind of robotic arm we should make for our project. We want to choose the more popular, commonly used in the industry, but we don’t know which. Can someone tell among 4 and 6, which number of dofs is more wisely-used?

submitted by /u/KaguyaTheOneBestGirl
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