I see the question I was about to ask was answered a year ago here.
We need to get between the 2 cities on Saturday 29th April and it seems like a TGV with a cafe might be a better bet than a regular (if comfortable and functional) Swiss train between the 2. Even if it’s only to get a cup of coffee in Switzerland at French prices.
I thought that not-sitting in a TGV was a non-runner as a general principle - do they really let everyone on (a TGV) in Switzerland regardless of space?
Alternatively, does anyone know of other trains between the two cities that are different than the regular SBB trains? Yes, I’m a train nerd.