Who had the best feud between on these classic black sitcoms?

This is kind of tough without Martin and Pam even being in the running for me, but there are people out there who may give to them. I will give it to Fred and Esther with George and Florence coming in at a very close second. Most of the times, it looked like Martin and Pam were trying to hard. Like they tried to rekindle the magic that was displayed on The Jeffersons and Sanford and Son.
Thoughts?
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