A Bucket of Wisdom

Which is more durable Canon or nikon camera batteries ? I have posted in my travel blog my desire to have a DSLR Camera this coming December. I am confused which of the leading DSLR Camera brand is the best. I browsed the internet but both of them claimed to be the first in the industry, so I decided to let buy the first store outlet to extend the lowest promo rates this Christmas. I am planning to buy the D600 of Canon but a friend suggested to get the Nikon equivalent for it.  I have not decided it. The  brand who can make a good offer will prevail.What do you think? Is this a good idea?