Seattle Sounders holds the record for the highest average attendance in MLS history, with over 44,000 fans per game.
Houston Dynamo won the MLS Cup in 2006 and 2007, making them the second team in MLS history to win back-to-back championships.
Seattle Sounders joined the MLS as an expansion team in 2009 and have quickly become one of the most successful and popular teams in the league.
The two teams have a rivalry known as the "Texas Derby," which is a heated competition between Houston Dynamo and FC Dallas.
Both Houston Dynamo and Seattle Sounders have passionate fan bases, with lively supporters' groups such as the Dynamo Supporters' Trust and the Emerald City Supporters.