Aspects for choosing a bike to ride across Europe
There are a few factors to consider.
How much luggage do you want/need to carry?
Stopping in hotels, or carrying a tent etc?
Is speed/efficiency important?
Can your flexibility/core strength support long periods in a more aerodynamic position?
You certainly can't go wrong with a traditional touring bike like the ones you mentioned, but there are other more modern and lightweight options available.
My personal preference for such a trip would be a race orientated gravel bike (like a Cervelo Aspero for example) fitted with bike packing bags. Fast, efficient and fun to ride, but with features that are good for touring like extra bottle cage mounts and top tube bag mounts.
But that is my preference for how I like to ride - others would have different ideas and priorities.  The best we can do is give ideas/options, but only your own preferences and experience can tell you the right answer for you.