Project DIVA Future Tone: Hatsune Miku!

Hi, I recently discover the game Project DIVA Future Tone: Hatsune Miku for play 4 and OMG I REALLY WANT IT!!!I downloaded the betta version, but it only has two songs. The game is dividided in two parts: Future Tone and Colorful Tone, both have more than 100 songs and both cost the same, around 30-40£.I will buy one of them, WHICH SHOULD I CHOOSE??!! Please tell me!
Aina :3