I love LoveLive! and Muse & Aqours and the music and CDs and BDs and books... and this game! I play it too much and draw too much but I enjoy it so I guess it's OK!
Japanese is best. Some of the English version translations are... chotto... But English is fun to play as I can meet all my friends here. Japan's top players are just crazy good and have crazy good teams and there are so many people that I hardly ever meet friends in score match. So English is more fun in that way.
Have fun! Just remember that, always keep it fun! Have to remind myself that sometimes...