Whole spread laid face down - then I flip them all over.
I don't like laying them face up one-at-a-time as I prefer to avoid jumping to any wondering conclusions on single cards
- I like the overview first.
Reversible back or not - makes no difference to me. It doesn't bias my reading or anything knowing I have a reversal in there beforehand - in fact I find that rather exciting...
And I like looking at interesting backs. Lol.
The backs that give me the greatest pleasure... are the ones I was able to choose myself (Seven Stars decks - so Deck of the Bastard and some of her Lenormand decks).
But if I were time limited I might just stick 'em all down upright immediately.