Which bike would you recommend?

It used to be that canyon was great value, but it seems they’ve lowered the spec on their entry level endurace in the US (a year ago the aluminum endurace 6 came with 12s 105 for the same price as the 10 speed tiagra model you have shown). Back then I could justify canyon using hard to find parts (1 1/4″ steerer tube and special bearings) with how much money you saved. But seeing as it’s the same price as the trek, go trek. The trek will have better parts availability and stores that can service you everywhere, canyon has months long lead times for parts, and you have to find a shop that will take them.

As far as the $1699 vs $1999 trek. Up to you, do you have money to spend? Get the $1999. If you are more budget conscious then $1699 would be great to ride still. Spend the extra money on comfortable bib shorts or something.

Idk if you’re new to the sport or not, but the 10 speed domane has 32t (can be upgraded to 34) as the lowest gear in the back, which gives you 34/32 as your lowest combo. The 12 speed has a 34 in the back (can be upgraded to 36) so if you live somewhere hilly the 12 speed will give you easier gears. Additionaly the 12 speed is what most would consider a “race ready” groupset, so if you want to go that route you’re absolutely able to (but you can totally race on the 10 as well).

In summary, the canyon’s will be harder to get spare parts for, and no longer justify their price imo. The $1699 trek is a great option if you want to save some money and get yourself some accessories (maybe nicer tires). The $1999 trek is also fantastic, especially if you want to climb lots of steep hills.