Personally, I believe that Lewis Hamilton will end up getting the better of Jenson and eventually be favoured at McLaren.
One thing that irks me is the belief that because each of the drivers has one WDC they are of equal quality and inseparable.
Lewis Hamilton did not have a lot of support from Heikki pointswise whereas Button was usually tailgated by Rubinho in his wins.
No one would say Michael Schumacher is more than twice the driver Ayrton Senna was despite him having 7 titles to the Brazilian's three.
Similarly, Schumi 7 WDCs, Badoer 0 WDCs implies that Schumacher is ∞ times better than Badoer (although this point is up for discussion

)
So that argument is moot.
From watching their driving styles, it is abundantly clear who is more smooth and who is more aggressive. This season, every driver will be adapting their driving styles to the new regulations and I believe it will be easier for Lewis to tame his aggression than for Jenson to be more gung ho. With a pool of drivers (Hamilton, Button, M. Schumacher, Rosberg, Alonso, Massa, Vettel etc.) all vying for victory, qualifying will be integral and this may be where JB will suffer.
Undoubtedly, Jenson trumps Lewis in terms of consistency, but the new points system does imbue drivers to be more aggressive. For example, three 3rd places and a DNF earns more than four 4th places (45, 40) for the first time in Formula one history. Also, three 2nd places and a DNF is equal to 4 third places (60,60). The balance between consistency and aggression has shifted towards the latter.
2010 will be a very interesting season anyway and I impatiently await the first Grand Prix of the season.