The city of LA won't care if the Clippers leave. They have always been a perennial loser (minus the last few years) and 2nd fiddle to the Lakers. They also have never made an NBA Finals appearance. The Sonics have a strong basketball history that includes a championship and another finals appearance agains Michael Jordan.
The Kings have a history of moving from town to town. They've only been in Sacramento since 1985. They have some history, but the Sonics had a longer history in one city while winning a championship. The Kings were exciting during their early 2000's run. I enjoyed watching them play and feel like they were robbed of making the finals, but the Kings had very little to no star power. The Sonics had star power. It's why there is a thread saying people miss the Seattle Sonics. You were born in 91 so when the Sonics were in their peak you were in elementary school. Some of us older heads, myself included, remember that team much different then someone your age ever will.