Actually we've found the menu to be very different.l We like filet, it's not available at lunch. Some of the desserts aren't offered at lunch either.
I'm not saying lunch isn't excellent there, but it's definitely a different menu than dinner.
I guess it depends what you like to eat.
Keep in mind that the portions for both meals are large, so if you aren't a big lunch eater, or have a big breakfast planned, dinner might be a better option.
Anne