Alonso and Vettel. They’re brilliant all rounders – both are intelligent, strong willed and capable of leading a team, whilst at the same time being ferociously fast. They make very few mistakes, and those that they do make are often only minor ones which cost them very few points.
They marry searing pace to outstanding consistency, which over the course of a season and given a decent enough car is a near enough unbeatable combination. Sure, on some days they might be outraced by a Lewis, out thought by a Jenson, or out gritted by a Webber but none of them are able to do so consistently enough, are their deficiencies in other areas offset the great work they do in others.
If I had to pick between Alonso and Vettel I’d say Alonso, but that’s only because he’s proven he can fight at the front over a longer period of time with different teams. Give it five years or so and I’ve got a feeling I might be humming a different tune!