Sup /vp/,

I'm about to start a new adventure with my pokebros in Sinnoh, but I'm unsure whether to play Diamond or Platinum.
Platinum obviously has more pokemon to choose from, a Battle Frontier and some other improvements. But then again, Diamond has an actual casino which is a fun way to earn coins, much better than trying to find coins people have left in slot machines, and ofcourse Dawn's superior outfit.

Which should I pick?