Attendance and fanbase size, success and i feel like recent success definitely has more impact than long ago success, Melbourne are bigger than some old giants like the dragons for example. My list i would have to go with

1.Roosters - Top 4 crowd attendance, one of the first clubs and 2nd most successful ever but what sets them apart from the bunnies is a ton of recent success + being a regular contender.

2.Broncos - The team of the nighties, powerhouse of a club that has a huge region of support and a big stadium with the biggest crowd attendance, also have an insane record in GFs.

3.Parramatta - The team of the 80s, dunno bout yall but i see tons of parra jerseys especially before the final last season, top 4 crowd attendance I believe, big supporter base full of passionate fans, bit of a sleeping giant.

4.Melbourne Storm - Arguably the team of the 2000-2020 era, powerhouse teams with some of the best to do it. Large fan base both from success but alsp owning an entire region, top 4 crowd attendance i think.

5.Souths - One of the oldest clubs, the most successful club to do it. Would be higher but 1 premiership in 50 years and relatively underwhelming crowd attendance has them lower than bunnies fans would like, bit of a half asleep small-giant

6.Controversial but i have the Panthers - I think 5th or 6th for average crowd attendance, top 8 for members and a loyal fan base at its core thats stuck through hard times + a recent influx of polynesian fans who love the poly panthers players. Recent success has us as the current team to beat, prems in 91, 03, 21,22 are pretty respectable.

7.Bulldogs - Historic club with plenty of success in different eras, a bit of a sleeping small giant as well, on their way up and will probably shoot up this list in a decade or two ( just my prediction ).

8 Was between manly and cowboys but ive gone manly, Never had a spoon ( yet ) successful multiple eras with many great players, good in recent memory too. Fan base isnt massive but because of success and notoriety i have them slipping into the 8

The rest i CBF