Biggest Women's Basketball Countries:
1. USA (population 306m, 3rd largest in the world) arguably the most influencial country on the planet.
2. Russia (pop 141m, 9th largest)
3. Australia (pop 21m, 53rd largest)
4. Brazil (191m, 5th largest)
5. Spain (45m, 28th largest)
6. China (pop 1.3b, Largest pop in the world)
7. Czech Republic (pop 10m, 78th largest)
8. France (pop 65m, 20th largest)
9. Korea (pop 48m, 26th largest)
10. Cuba (pop 11m, 75th largest)
Biggest Women's Basketball Competitions would be EuroLeague including Russia, France, Spain, Italy, Turkey, Croatia, Poland, Greece, Israel plus many many more. All of which have high paying national competitions in their own right.
U.S.A. has a Women's National League Competition which runs for 4 months of the year and pays better than any Netball Competition in the world.
Pretty sure you've heard of all of the above countries.
Netball:
1. Australia (pop 21m, 53rd largest)
2. New Zealand (pop 4m, 123rd largest)
3. England (*UK pop 61m, 22nd largest)
4. Jamaica (pop 2.7m, 139th largest)
5. Samoa (pop 180k, 180th largest)
6. Malawi (pop 15m, 65th largest)
7. South Africa (pop 48m, 25th largest)
8. Fiji (850k, 157th largest)
9. Trinidad and Tobago (1.3m, 152nd largest)
10. Cook Islands (20k, 212th largest)
I've been friendly by combining the population of all of UK in under Englands stats. I could go deeper but that would only make Netball's figures look even worse.
Outside of the current ANZ Championship there isn't a signle other professional Netball competition in the world. Only the very elite players in the ANZ Championship get paid enough to live on. For the most part those saleries are supported by Government funding. The League itself is dead if not for the Australian Government. ONE competition, ONE chance to play professionally.
On a world scale most in Netball consider there to be maybe 5 real countries. Australia, New Zealand, England, South Africa and Jamaica. That's it.
Try playing Netball at an Olympic games, you can't.
Ignore the tradition and ridiculous bias of this Country's Governments and Media and it's pretty clear which sporting path a budding young female athlete should follow.