Okay, this one really depends on what you're looking for from 'the Paris novel'. If you mean that atmospheric, walkable-city-as-character vibe, the physical object itself matters almost as much as the words. I picked up the Vintage Contemporaries paperback years ago for a trip, and the cover art—that sort of blurred, rainy Paris street scene—just felt right. It’s sturdy, the font is clean, and it fits in a coat pocket. But if you're after a definitive, 'serious reader' copy with extras, the FSG hardcover is the one. The paper quality is noticeably better, and the introduction provides some great historical context about the expat scene that deepened my second read-through. For pure aesthetics, the illustrated edition that came out a couple years back is stunning, but honestly, it's heavy and more of a coffee table book than something you'd actually curl up with.
A lot of people swear by the audiobook narrated by the author for this one. I gave it a listen during a long drive, and hearing the descriptions of specific arrondissements in that intimate, almost confessional tone added a whole different layer. It felt less like reading a novel and more like being told a secret. So your 'best edition' might not be a book at all. For me, the search is part of the fun—scouring used bookstores for older prints with different cover art. I found a 90s edition with a simple black-and-white photograph of a bridge that I now prefer to my newer copy.