Depends on the size of the crown. Most of the time upside down.
I did 2 house in Florida with 10" crown, I made sleds for my table saw to cut it. That was fun.
Flat - it is the way I was taught - practically know what the bevel and miter should read to adjust for out of square corners (but I used to have a laminate cheat sheet).
Been cutting upside down and backwards since 10 years before I ever saw a compound miter saw. Flat cut it only if its to big to bed it against the fence.:thumbsup:
Whenever possible, upside down. It's easier.
Here's one cheat sheet for laying flat. http://www.dewalt.com/us/articles/article.asp?Site=woodworking&ID=2
I've also seen calculators online that you just enter the spring angle and corner angle and it gives you the settings. A Bosch miter finder will also tell you the settings.
Flat... I don't see how this isn't faster and easier once you know your angles. First time i ever cut crown I did it upside-down and angled to the fence, I might have been doing it incorrectly but i found it hard to get my angles perfect.
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