I don't really think I could pick an absolute favourite band, especially since I grew up around Pink Floyd, Queen, The Beatles, AC DC, Guns n roses, etc., you know, the great classics of the previous generation, but if we're basing it off what we've been listening to the most over the years it'd have to be a close race between three players; Dark Side of the Moon (Pink Floyd), FFVII OST (Remastered) and Bag Raiders.
I think the genre of music is a really easy one to pick though; I'd class it as 'Emotion Music', i.e. music that causes any sense of emotion (whether it be happy, angry, sad, etc.). This genre, to me, seems to be great orchestrals and truly unique sounds. It's kind of hard to explain, but all three of the albums I've listed above should give a good idea of the concept I'm trying to get across.