open ended straights VS flush draws

[ur2god]

so i ran this in a simulator
flop: Ad 5h 6h

scenario 1:
player1: Ac As
player2: 4s 7s

scenario 2:
player1: Ac As
player2: Kh Jh

I ran these scenarios in a simulator and
it actually said the open ended straight had
a slightly higher % to win over the flush draw
by like .25%.
but isnt the flush supposed to be easier to
hit because having 9 outs instead of 8 for the open
ended straight?