No right answer here.
You want to make a big directional bet on any underlying? Buy/sell the futures. You want a less directional bet? In the options, a short position is synthetically equivalent to short 1 ATM call, long 1 ATM put, so if you wanted to get less directional you could sell a call.
One option could be to sell a 70-80% OTM call in GLD and then use those proceeds to purchase a GLD put spread so that net you are getting a credit or paying a small debit. I like those types of trades because if you are net bearish on an underlying, you can make a directional bet that has low cost basis in the case where you are wrong (GLD goes up) and you get paid in the case where GLD goes down.