I agree with SFO 1K. The flight from SFO to LAS will not take anywhere near two hours. You basically reach your cruising altitude and then head back down.

And you will receive the tapas trio, which is tasty, but I wouldn't consider it a meal by any stretch of the imagination. I think F has access to snacks from the back, too. So your decision comes down to a more comfortable seat and whether you can drink $100 worth of alcohol in about an hour.