Nothing wrong with Ultegra. I certainly wouldn't pick based on the Shimano parts hanging on the bike. I've never rode either, so I can't tell you which I would buy, but in any case, unless you're buying it for me, that wouldn't do you much good anyway.

Test ride both of them. Test ride them repeatedly if necessary. (If they're at the same place, great. Go back and forth between them, with the bikes identically set up.) Make sure the positioning is set up right for you so that you're testing the bike, not the fit. (Same saddle height, same reach, same amount of drop.) Pick based on which one you more enjoy riding.

If one of them has a nice, lively feel and confident handling without beating you up, and it doesn't show any undesirable characteristics, that's the one you want. Make sure you like it uphill, downhill, through rough patches of road, and through turns. In the saddle and out of the saddle. If both of them show undesirable characteristics, keep shopping. When spending that much, you should expect to be completely happy with your bike.