Self explanatory.

I myself am a fan of Avia's music, while Cragspur's battlefield is quite fun (especially when you're defending ).

I don't listen to the music. I like the Pugilis the best, but the one with the flames and statues (Ghost kingdom?) is fun too.

That one has certainly grown on me after many trials on it :P
I can't stand the Steel kingdom though, the AI is sooo stupid and you spend most of the time trying to track them down before they're spotted by the cameras or get stuck on a gear.

I really like Cragspur's and Viperia's battlegrounds. No annoying gimmicks and fun to defend. Third favorite would probably be Yaksha since it's a straight-up brawl (except for thr roulette thingy). To be honest I havent't paid much attention to the music!

I like defending Ignis with a fire/flying because you can just go over to the little island and stall.

For music, Aurora, but I love the music when you fight Nobunaga, Hideyoshi, Mitsuhide, and all of them after (SPOILER ALERT) linking with Arceus. And the Park music is amazing.

Yeah it is. The credits music is amazing for the most part as well. I'm particularly fond of the park remix contained within.

EXACTLY! I just put Aurora, Credits, and Park on my iPod earlier today and I usually fast forward to the park part in credits. Too bad it takes so long on the iPod Shuffle.

Lol. The credits are really great at the beginning until after Nixtorm's theme plays, then it kind of dies until the Park theme pops back up :P