I think for a few decades there's been two major factors to take into account when collecting action figures; detail and articulation.
In all honesty I prefer more articulation in my figures over more details, but I'm sure there are a lot of people who choose details in the figure over articulation.
Example:
This Mario figure from Jakks Pacific has great details, but the leg articulation is very lacking.
This Sonic figure from Jazwares, on the other hand, has a lot of articulation, but as a result Sonic's waist is too small and his arms look bony.
Alright, who here prefers articulation over detail in action figures, and vice versa?