Fifth Gear. By far.
If there's anything worse than automotive journalism in the form of regurgitation of a manufacturer's brochure (like, say, Autoweek or MotorTrend) it's unrelenting criticism. And that's pretty much all Top Gear does.
If I watch an automotive TV show (which I rarely do anymore), and I want a review of a car, I want the pros, cons, and a reasonably accurate description of the intangibles that can't be conveyed by a spec sheet.
What I don't care for is to tune in every week to find out what new insult some ignorant buffoon has had the writers come up with so he can flame anything and everything they "review".
To be a critic is (obviously) to be critical. But to be critical is not the same as to be hateful. The people at Top Gear are hateful people. And I'd rather spend my time watching a car program where the reviewers enjoy what they've driven, not waste time on insipid drollery.
And Tiff Needell is eminently more qualified to review cars than Jeremy Clarkson. Clarkson is a reporter who grew up a spoiled brat, and parlayed his interest in the six-figure cars his family owned into reviewing cars. Needell was a schmoe structural engineer, who in his spare time began a racing career, and after 15 years or so of racing began a career as a reviewer.
And Jeremy Clarkson is a repugnant ****head in general