By this I mean the most stacked with the best possible matchups on the top 10.
In the last few years, it was 135 or 147 but both divisions have been watered down. HW has been the best in the last decade due to Turki making things happen. Tbh it might just be the hottest division right now due to matchups being made.
Jr. Middleweight
Jr. Welterweight
Lightweight
Bantamweight
Super Flyweight
Strawweight
Lightweight probably the most stacked with new talent and up and comers like H20, Kid Austin, Abdul Mason, Andy Cruz etc
126 or 118. 126 has a bunch of good fighters: lopez, ball, figureoa, ramirez, espinoza, and soon innoue. 118 has 4 Japanese guys as Champs but of course they won't fight because boxing is boxing
Any division that doesn't have the diva "cash cow" fighters like Canelo or Tank because most of those divisions just have guys standing around waiting to fight one of them, while not fighting each other.