You are vulnerable vs not vulnerable. Your right-hand opponent opens one club in second seat. Should you overcall one heart or make a takeout double with this nice hand?
I vote for the takeout double. You have a good 18 points and both majors. If partner happens to advance with two diamonds, you won’t be lying with these values to bid two hearts at your next turn.
If your spade holding was slightly weaker, for example K Q 9 3, I would prefer the one heart overcall. That K Q J 9 of spades you actually hold is worth more than its six points.