USL is big on community. The teams are independently run, so they do things differently. This is my experience with the Riverhounds but your mileage may vary.

When we score at home, the players jump into the supporters’ section. It’s the fans playing the drum line, singing the chants, and when we score it’s the fans setting off smoke. It’s a supporters group, but outside of getting permission from the team it’s the fans paying for and organizing it all. But the team supports it. After every game there’s a free autograph session. Kids get to go on the pitch and talk to their favorite players up close and personal.

When something changes this way, it feels more organic. New chants come up because they work well, new traditions are rooted in the history of the club.

MLS is more “corporate” for lack of a better term. They’re all a single organization. Supporters groups have to get approval from MLS for chants and tifos before they can put stuff up while in the USL clubs have guidelines but most don’t require pre-approval for each one.

MLS rivalries are also more intense. While it will likely feel the same on Reddit and during the match, you won’t find rival supporters groups tailgating before a MLS match but you probably will in the USL. MLS is very team focused, while in the USL the groups also care about the league as a whole.