Hi i never played a Earth 2150 game, and i wonder what faction is the best to start, because i have readed that this game is HARD even in EASY.

And also... i'm afraid of the 183 days limit, it's difficult to acomplish the campaing in this time limit?

Well, the easy campaign is the Lunar Corporation. Then I believe the next hardest is United Civilized States, and lastly the Eurasian Dynasty for the hardest campaign.

However, I only read this somewhere and I think it's the order the game offers them to you. It is a hard game and I was too fearful to use up my resources on my units and bases, so I only got so far then got wiped out as my units were too few and too weak as they weren't upgraded enough. :(

Thx i will try this order

I definitely think that it's more like UCS campaign is the hardest. Lunar campaign missions are easier, but meeting the final objective for the ED campaign is the easiest because the goal is to collect 1 mil resources, and there are just so many ED missions that collecting that much is really easy, even if you fail a lot of individual missions. However, all the most powerful ED technologies are only unlocked through missions, so failing a lot of them will make the campaign more difficult.