Its hard to tell without seeing yours eyes and complexion better. You wear both colors very well though and have very shiney hair. I think I like the style better and it looks shinier surprisingly with the blonde. I say blonde but with a bit less gold.
BTY, I'm actually in the same dilemma deciding between brown and blonde (I'm currently blonde). The difference is that I have naturally curly hair and usually go darker in the summer so that it doesn't look as frizzy since I always wear it straight.
I really think you look great both ways. I prefer the darker blonde picture posted (the second picture you posted), you look best there IMO. I don't like the really light blonde color as much, it makes you look a little older. Seriously, you can't go wrong with either color, you're pretty both ways.