CAF says it was chosen based on the technical performance, innovation and cost it offered in its bid.

CAF Intercity Trains for SNCF

The Spanish rolling stock manufacturer will deliver electric multiple units that will have top speeds of 200km/h. The trains will feature ergonomic seat designs, wifi, power sockets and USB ports, and space for up to ten bicycles. Persons with reduced mobility will be able to board the trains without external assistance.

SNCF will start operating these trains in 2023. Over time they are to replace Corail passenger rail cars and their locomotives, which first entered commercial service in 1975.

If the Board of Directors approves the decision in October, CAF will manufacture the intercity trains in Bagnères-de-Bigorre in the Hautes-Pyrénées and Beasain in Spain’s Basque Country. CAF took over the Bagnères-de-Bigorre site from Soulé in 2008. It says it wishes to turn the site into an ‘industrial campus’ comprising a modern factory and training centre. This contract could cause the number of jobs at the the site to increase from 100 to 350.
source= https://railway-news.com/sncf-chooses-caf-28-intercity-trains/