INDOOR INDOOR INDOOR.
Even though stadiums mean more tickets, they're SO much hassle.
I've gone through so much crap at stadium gigs before, security letting in certain entrances before the other so I was left with a crappy place, bad weather, the fact that the crowd is so big that security can't see everything (resulting in horrible annoying drunk people) and sometimes the sound can be really bad in some stadiums.
Arenas are kinda more intimate though (obviously not as intimate as clubs/theatres but Katy's past those kind of places now...)
So yea. Indoor.