Although I myself favour Alpha Site, I would presume the other map based off of Uplift Reserve, Lost Platoon would be best due to the ability to use Choppers, Warthogs, and Wraiths(with some skill but still possible). With such an open area having one team of two on a Warthog and another team of two on a Wraith would probably be your best bet, going with the idea of never stop moving, being as ammo isn't an issue and if done right, the end of each round presents every player with regenerated health. If vehicles aren;t your dig there's plenty of cover to make way with the Plasma Pistol/Magnum combo using the building as cover, but that's only recommended for a last ditch effort when all vehicles get downed.
[Edited on 07.17.2010 5:11 PM PDT]