If the dealer’s test route is freshly surfaced, ask for a diversion. An uneven bend you know well is more useful for comparing Tour and Sport. See which car needs a second steering input after a bump, and which lets you hold the line you intended without thinking about it.
Make sure the cars have comparable tyres before you draw a conclusion. Pressures, tyre type and wear can all colour your impression. Take the same route at the same pace and give yourself enough time in each car to get past the first impression.
There’s a good case for the firmer setup if you spend time on circuit. If you’re mostly on patched British roads, buy the one you want to drive home in.