I've been on Chacahoula swamp tours in Westwego twice. This guy is great. The boat is really small, so it's very personalized and can get places the big boats can't. The guy knows tons about Bayou Segnette and offers plenty of Cajun flair. Plus he calls gators and raccoons to the boat, and they answer! It's close to the city and only costs 20 bucks- well worth it compared to the big tours. Great for kids and out-of-towners.
Pros: personal attention, very knowledgeable, authentic