The comparison between Glastonbury and Tomorrowland is obviously subjective as both festivals offer different experiences. Glastonbury, held in Somerset, England, is renowned for its eclectic lineup that spans multiple genres including rock, pop, electronic, and folk, among others. It's got a long history and always surprises festival-goers with its great lineup. Tomorrowland, on the other hand, is predominantly an electronic dance music festival. Which is "better" depends on your personal preferences for music genres, atmosphere, location, and the kinds of extra-musical activities you're interested in. They're both huge July international events, offering unique experiences.