I loved everyone of those songs, but My Time was his theme for when he didn't get along with management.
Time To Play the Game is what he should use as it is his most recognizable song he has, and in 15 years from now, he will be remembered with having that music.
The Game by Drowning Pool was used in WM18, and was used shortly after WM, it was a good theme, but with the lead singer of drowning pool dead, I doubt they will use that theme, and plus it hasnt been played enough to be recognizable.
King of Kings is what he'll probably use when he's coming out to cut a promo or it will be used in the beginning of his entrance than it will cut to The Game like at WM22.
The Game/My Time is cool, but he never came out to it, and it was only on the WWE The Complete Anthology CD. So I doubt he'll use it.
But I think he should use Motor Head's the Game. Thats his most famous music and should be used for him for the rest of his career.