It’s not ‘better’. They are completely different works. Both symphonies most well-known movements are the respective 1st movements. 5th’s first movement is powerful while the 6th is calm and beautiful. But the 6th symphony is known as the Pastoral and is wonderful, but very different than the fifth symphony.

On mobile which is why this reply is so short.

Because 7 ate 9

Because otherwise we wouldn’t have Walter Murphy’s “A Fifth of Beethoven”.