Girls, Defined Arms or Six Pack Abs?

If you had to choose between these two, which do you find more attractive on a guy?
If you could magically wave a want and put these either of these on ur partner which would it be?

Defined arms (biceps, triceps, forearms) or six pack abs.
Update: Alright 6 to 4

Another victory for the Six Pack!! ;)
Update 2: okay 6-5
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