All great bikes. I personally just went through exactly what you did (replacing a old mountain bike with a hybrid / flatbar road bike). I had a few I liked, but narrowed it down to the Trek models as that's what my preferred Local Bike Shop carries. I wanted to have my LBS do all the service (and my preferred LBS does free adjustments for life if you purchase through them). If you're in the same boat as me then that might help you decide. If you're going to maintain it yourself then your LBS does not matter.

I had narrowed my choices to the Trek 7.5FX and Trek 9th District. There are many differences but the one of the main differences is that the 9th District has only one gear up front (with 9 gear cassette in the back) thus limiting the available gear range and ratios. Depending on where you ride a 9-gear bike may be enough - in FL that's plenty. So, I decided on the 2013 9th District and am very happy with it. If you are curious the 54 cm size weighs in at 22 pounds (a pound lighter than the 2013 7.5FX 20 inch size - I'd venture to guess that the 7.6FX is similar weight). Be careful about posted weights on manufacturer's websites: the 9.84 kg probably refers to the XS size for the Scott bike. So, as Dunbar has already pointed out the differences in weight will probably be very small indeed.

Other things I considered (mostly superficial reasons): how prominent the bike branding was on the bike frame (I did not want to be a moving advertisement for Trek), internal cable routing (makes getting on-off bike carrier a little easier), ride quality (probably the most important thing anyway), and price.

Good luck!