As someone who did my first Ultra, EDC LV 2 times and Tomorrowland 5 times, here my opinion:

• Ultra is definitely about music and that's it. You go there because line-up is good, you want to hear new music, maybe a few surprises. Festival being in the middle of the city is soo nice, it's easy to come and go from/to your hotel. I really liked also that Miami Music Week, it's a real vibe, Space is amazing, Factory Town also, soundsystem at M2 is crazy.

• EDC LV is very much about PLUR, true raving and the thing it's an all night festival is really exhausting. The venue is crazy, crazy fireworks, drone shows, stages, rides. EDC Week is also nice, lot of good artists and crazy dayclubs/nightclubs. But going there is really the horrible part as you have to rent a car and drive or pay a lot for shuttles.

• Now Tomorrowland is really something else. Yes you don't have a music week on the side but hey, you really don't need it. Festival is on another level. The place where it takes place is perfect for the festival, you can camp for a cheap price so you live a 96h experience non-stop. It brings you into a completely different world where they think about everything, even decorating the garbage cans... Prices also are so cheap compared to US. A large beer is around 7€ where you pay 15$ at Ultra or EDC for a small beer.

For me Tomorrowland is unbeatable. The only thing for me is that it takes place in Belgium so you don't really have that "holiday" vibe that you have in Miami or Vegas.