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6
PositionIndex[Sign[x - y]] @ -1
{2, 3, 6}
Also
PositionIndex[UnitStep[x - y]] @ 0 (* thanks: J.M. *)
{2, 3, 6}
PositionIndex[Negative[x - y]] @ True (* thanks: anderstood *)
{2, 3, 6}
PositionIndex[Thread[x < y]]@True
{2, 3, 6}
If you prefer to have {} (rather than Missing["KeyAbsent", _]) as output when no positions satisfy the ...
6
Flatten@Position[Negative[x - y], True]
Also possible:
Flatten@Position[x - y, _?(# < 0 &)]
or, as suggested by J.M.,
Flatten[Position[x - y, _?Negative]]
6
Flatten @ Position[Less @@@ Transpose[{x, y}], True]
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