LBS support for a bike like the Tarmac would be a big factor in my decision, for repairs/maintenance and possible warranty issues.
The problem with the Aeroad is the integrated cockpit. You’ll need to make sure you can get your fit right, and hope you don’t crash or have another issue with the bars because replacements can be difficult to get. It’s possible the service would be better for you in Europe but it seems like many people in the US are very unhappy.