I've got a mk6 Golf 1.4 TSi as a company car and it is as sweet as a nut. However mine is Match spec with cruise, DAB touchscreen, auto lights, multifunction wheel etc, the S really is pretty basic so I'd go with the better specced Leon in your case. Don't really see where the head vs heart comes into it as it's a company car, resale etc isn't a factor.
One thing I would say is test the petrol TSi if it's an option as I drove the 1.6TDi before I got mine and it felt sluggish, only being 5 speed with long gearing for economy didn't help. Not sure if that's changed on the mk7 though. Petrol might cost you a few quid more to run but well worth it IMO. I get 38mpg mixed and sit in the fast lane most of the time, have squeezed nearly 50mpg out of it on a 65mph run.
Took mine to Wales with a mate last year, took both our bikes with gear quite comfortably with the rear seats folded. About to hand it back to get an S-Max, will be sorry to see it go