I am trying to remember what the first Sarah Jane Smith story is. I like her in Robot, which is the first Four episode, but I would like you to see her with Three, too. Because of the different dynamic with a wildly different Doctor. Because of the Rose/Doctor love we modern fans really never did get to see what a radically different Doctor is like with a long time companion. Rose has such an emotional reaction that it is more about the lose and return of her lover than the old style of learning about a new Doctor that we get when Three becomes Four.

Also, if you watch Season 14, you will probably fall in love with Four. Though, he could never take over the place in my heart that Ten holds.