Baseball is the most intense. You know what is happening and exactly what the team needs so it's easy to understand and follow. Also no clock. Anyone can still win it. The last 3 outs are always hype.
Hockey tends to go to game 7 A LOT. There's less commercials. But I don't really watch hockey.
NFL is exciting but the blowouts are tough to stay entertained. Last year's Superbowl was the worst and there wasn't really a chance at a comeback.
Basketball is basketball. Extra commercials, longer commercials, games drag. Refs get involved. You can tune in to the last 5 mins and not miss much except for highlight plays. The best team almost always wins so no upset or Cinderella story.