Best Guide Book: Voie du Piémont?

Hi. I'm in the preliminary stages of planning a walk from Carcassonne to SJPdP and beyond (likely the Primativo) beginning around May 21st next spring. The two principal guides that I've found referenced are French language guides, both published in 2022; 1) Topo Guide, Chemin du Piémont Pyrénées GR78 and 2) Lepère & Terrien, La Voie des Piémonts. I've searched the forum and haven't found a comparison of the two or a clear recommendation. If any one has experience with these guides I'd appreciate your input, both positive and negative. I've a little French (some might say very little) and I've used the Miam Miam DoDo guides often, so I suppose a similar styled guide with interpretive symbols would help. I'm more partial to guides with good quality maps. On that note, does anyone have a reference to the GPX for this route, or is it well marked? I would be transferring it to GAIA app which I've used successfully on other more remote walks. Thanks for any ideas and thoughts!