David Coulthard admits it's hard to predict who is going to win the battle between Lewis Hamilton and Jenson Button at McLaren.
Several people have questioned the wisdom of Button's decision to join the Woking-based team and Coulthard told Crash.net Radio that the move will give the former Brawn man a chance to show what he's made of.
"He could have stayed within the comfort of Brawn - which has obviously now become Mercedes Grand Prix - and defended his title there, but what he's done is to give us all the opportunity to really see how good he is," the former F1 driver said.
As for who will win the battle between the Brits this year, Coulthard prefers to sit on the fence.
"I know them both personally and this is going to sound a bit sycophantic, but I think they're both well-rounded individuals and great drivers, and I'm curious, genuinely curious, to know which one is going to best handle the 2010 regulations and the challenge of competing against each other.
"There's no question that Lewis Hamilton is a great driver and there's no question that Jenson is a great driver, but one of those guys come the end of the season will be on top - and it's going to be fascinating to watch. I don't know the answer - let's wait and see."
