Who would be the powerful Gundam00 - Mobile Suit

I was browsing on one of the anime sites yesterday and have read about this comment from one of the viewers....
Which says:

"which gundam do you all think is the most powerful so far? Some might argue Exia because of it’s double cores however it is still a close range unit. Each Gundam excels in it’s own area. with that in mind, if they all had double cores, which would be the best?"

So why dont you share your own opinion now?. .
You can post a comment to justify your own opinion..
Also i have prepared a poll for it on my sidebar.... Ehehe..