We had dinner at Little Serow on Thursday and there's no question it was a good meal. But dinner for two, with a shared ~ $20 bottle of beer - Red Rice Ale from Japan's Hitachino's Nest Brewery - and an tip appropriate for the excellent service means you depart with $150 less in your pocket than when date night started.
By contrast, it's hard to to leave Bangkok Golden having spent more than $50. The food is just as flavorful, if not more so - the grilled pork neck stands-out as a particularly good, particularly reliable staple of our meals there. Moreover, we haven't had a dish at Bangkok Golden where we found ourselves thinking 'what went wrong there?' - in the case of Little Serow, there was a smoked eggplant that really just smelled/tasted of charcoal (and completely overwhelmed the delicate duck egg that came with it).
I'm curious what other fancy/expensive and casual/inexpensive comparisons Chowhounds have to offer.... I'm not interested in comparisons where one place is just plain bad. Rather, both are good/excellent but one is a more refined experience and the other is cheaper and more casual.