This is basically what we do every single trip!! We try to limit ourselves to one TS each trip that we book in advance. We MAY try to do a walkup (if we feel we can afford it) as well. If they aren't taking walkups, that's fine because we didn't plan for it anyway. We typically do two TS each trip, but only one we book in advance for. This year and last year are the only times we actually booked 2 in advance. It's never really a difficult decision for us...we like to try different things each time. So my answer? I don't know. It depends on what we feel like eating the next time around.