I also agree that FG is leaning toward becoming more TG-ish.
For example, recently they're doing more crazy competitions, like a Range Rover Sport vs a horse?!!! Or recording lap times for various cars around the same track to see what's faster. Also the cinematography has improved.
On the subject of 30min vs 60min, I also feel that 30min is too short. Actually, FG is really like 22min since they have commercials!!! TG will review a car for a good 10min or even more during a comparison.
Although I respect the opinions on cars from Tiff and Jason more than TG's crew, FG's reviews are too short so it seems they don't explain how a car feels as much as TG does. I am also an aspiring racing driver, so I value Tiff's opinion the most. But in the limited time he has to present, he just doesn't have enough time to describe how the car feels.
Its kinda like quality vs quantity. TG gives you more info, some of it useful, some of it useless. FG tries to cram as much useful info in a few minutes as possible. I gotta say quantity wins here and I prefer TG because if all I want to know is how fast a car is, I can look up stats in a magazine or on the web. I want to know how the car feels and behaves when its driven hard, and I think TG just does a better job conveying the driver's feelings. TG's dialogue uses analogies and comparisions to mundane things in order to describe a car's dynamics. Its like having a car discussion (or argument) with a friend over a drink. I like that.