Which Yugioh series do you like best and why?

I've been watching yugioh since I was five or six but out of them all I personally prefer 5d's because of the way the plot dealt with poverty and moving up in the world. Season to was mostly about bonds and having the main characters growing up and moving on to go down their own paths in life. Synchro Monsters also revolutionized the way the game was played and made it more enjoyable to experience and play.