Middle has always been the strongest with the most history but the heavyweight division is where it matters. Light heavy had great fighters passing through the division ie Ezzard Charles and Billy Conn but Archie Moore and Bob Foster apart there's not much.
I think Lightweight is probably the strongest. But heavyweight might have a case. Heavyweight counts for more than one division really though, it's always been unlimited. People might not appreciate heavyweights as much in terms of skills but I don't see the point in comparing heavyweights by the standards that favour the light divisions. It's different.
1) Welterweight 2) Middleweight 3) Lightweight 4) Bantam 5) Lightheavy 6) Feather 7) Heavy 8) Fly Something like that? though I am ignorant on a few divisions.
1. Lightweight 2. Middleweight 3. Welterweight 4. Light Heavyweight 5. Featherweight 6. Heavyweight 7. Bantamweight 8. Flyweight I can see 126 above 175 though.