I honestly think you should get both...but if you had to choose one i would say the mythic. Plus legendary might become free soon...
Mythic map pack mythic mature pack
Yes, like the original achievements, you can do the same for the Mythic Achievements pack.
Check if it got qued.
if you buy the halo wars LCE you get a code for the new mythic map pack on Halo 3
You can't unlock items, you have to download map packs off of Xbox Live. Like the Heroic map pack, the Legendary map pack and the Mythic map pack.
the code is 17489460
No. You either need to purchase it from the marketplace, or you can get the mythic disk when you buy Halo 3: ODST.
The Heroic Maps, Cold Storage, and Legendary Maps are Required. The Mythic Maps, however, are not.
You have to download it over xbox live
There are 13 campaign skulls ( 9 gold ones which unlock achievements and 4 silver ones which make the game more fun ) and 6 mythic skulls ( 3 for the halo 3 mythic pack and 3 more for the halo 3 odst mythic pack )
archon armor
Well, if you're talking about either the Heroic or Legendary map pack, then I assume you already know. The Mythic map pack, however, will be available both as a download (sometime in March) and included in the Limited Edition of Halo Wars.