RE: Which would you have?
It makes no sense not to have active cooling on Li EV batteries, it is a recipe for short life, so it should make little difference how they are actually 'packed'.
Oh, err.. oh yeah, the Leaf, Zoe and Kangoo all have no cooling....
I'm still not really sure the Fluence uses its battery cooling while in use, though, but rather for charging only. Heat will build up more easily in a 'monolith' than in a thin flat arrangement.