El Gaucho is the undisputed standout — proper Argentinian beef, wood-fire cooking and a wine list that takes imports seriously. It's the most expensive option on the soi by a margin, but the quality justifies it for a special occasion or when you've been eating food court Thai for a week.
Roadhouse BBQ covers the American end of the spectrum: ribs, pulled pork, brisket and sides. It's messier, louder and considerably cheaper than El Gaucho, which makes it the better choice for groups who want serious BBQ without the fine-dining overhead.