I noticed today a difference in the file format when I download in the Mac app vs the website. The app downloads a much larger file in the .tcx format. I import the files into Golden Cheetah and have not noticed anything different between the two. Any info on what else is include in the .tcx which makes it significantly larger? Just curious.
Right now, I prefer the .tcx file simply because the the name includes the date. I have to manually rename the .fit files because GC can’t handle two files called “Baxter.fit” for example.