Melee alt: DK or Rogue?

Which one is more fun for casual stuff? Dungeons, world quests, old content, maybe normal raiding.

I know "fun" is subjective. I like hearing why you chose or would choose either class.

Please Help !
Thanks !

I didn't find the right solution from the internet.

References:
-https://us.battle.net/forums/en/wow/topic/20759248461
-Product Intro