lol rugby. I was quite into rugby as a kid. Then I found out rugby league existed and I haven't looked back. In hindsight, Super Rugby started to decline once they expanded from 12 teams.
The biggest problem with rugby is games can take forever to flow. I watched a game recently and it took until the 20th minute for the game to start flowing. Penalties, scrums, scrum resets...you name it, rugby has a huge list of things which are extremely frustrating, even more so if you go to watch it live.
In contrast, unless there are lots of errors to start the game, it begins flowing immediately. The 40-second scrum clock (or whatever it is) is a big factor in this. You also get to watch it from both ends, so if you go to a live game, you should get to see a decent amount of action no matter where you sit.