All this Hi-Fi spec sheet comparison is just guesswork. On the track or on the road is where it matters. And what do you mean by fastest anyway? Off the line - diesel, top speed, petrol, quarter mile - depends on the driver.
For real world everyday use I prefer my diesel because I use the low-end power all the time, and the diesel has more low-end power than the LCR. I've posted about this before.
The LCR will win a race to top speed because it has time to get to peak power and stay there, the diesel has to shift gear earlier and runs out of rpm - and of course it depends on how good you are at speed shifting without breaking the box. Round the track, the LCR has weight and handling on its side (not a lot though, the Sport suspension is quite good) but needs a good driver to exploit both.
So, steffy, when you say "faster" do you mean off the line, in traffic, on a drag strip, round a racetrack, on empty country roads (good luck finding any)? The answer will be different for each . . .