...It was weird that although I ordered 2 identical sticks, one for me and one for a new H-RV owning work colleague, one formatted fine in windows and the other would only give the option of exfat or ntfs, hence requiring an external program. A smaller stick is an option and will save you a couple of quid maybe.
Although 64gb will let you listen to close to 20,000 mp3 tracks, quality dependent of course
Videos and higher bitrate mp3s will take up more room. Depends on your available library.