Admittedly, I've only seen a few episodes of the Jeffersons. Despite watching a mere couple episodes, I concluded that it didn't appeal to me. I'm sure the show has its own merits, but I have to go with the show that enthralled me from childhood.
How can anybody not be deeply entertained by this show? The show was thoroughly fun, from the delightful characters to the amusing situations they would get themselves into. Jack Tripper is one of the most entertaining characters I've ever seen. His charisma is easily tangible.
To be fair, I'll give the show one fault, and that flaw is that the show gets repetitive; a lot of comparable situations happen.
Three's company is a warm, cordial show that will trap you effortlessly. It may be my bias, but I'm voting for the show that I proudly touted in my sig: Three's Company.