I appreciate very much Kim's posting several days ago about SNCF's opening train ticket sales for travel through early May.
I want to be ready to purchase May 15 tickets from Paris to Bayonne when ticket sales open in several weeks.
Rick Steves' Paris guidebook gives several options for buying the tickets:
1. SNCF's website or app
2. the Trainline app
Also, one can buy tickets via the Rick Steves website.
My question is: what are the pros and cons of the 3 ways of purchasing the tickets?