I've never been a fan of TripAdvisor for restaurant reviews. IMO it's the lowest of the lows when it comes to crowdsourced content. I only use it as a last resort when traveling internationally since it's still probably in the most cities across the world.

Yelp has increasingly gotten worse quality wise too, and really only has enough content for the US. Internationally it's really sparse.

Today, I increasingly use a combination of:

• Google Maps because I find the quality of content on par with Yelp + I'm already using it to look up directions which makes it easy/convenient + it has content all around the world
• Michelin for major cities (especially the Bib Gourmand list)
• Niche sites like The Infatuation or Eater
• Foursquare occasionally when traveling internationally