Which of those bikes have you test ridden? If the answer is none, this is the first thing I’d do. Aesthetics don’t do much if you don’t like how the bike feels.
Fit + feel (= geometry) >> components, weight, etc.
- I’d forget about specs as long as the bike has 105 mechanical or above.
- You will likely want to upgrade saddle, handlebars and perhaps even the wheels, so those things wouldn’t enter the discussion in my mind.
- There are more and less aggressive endurance bikes.
- Tire clearance matters IMHO. A modern endurance road bike should be an allroad bike that has clearance for narrow gravel tires.
- There are sales on e. g. Bike24.de. They have a BMC Roadmachine Two on sale with Ultegra Di2 group set and all for 4,300 € or the Roadmachine X for 3,700 €.