>>9956799I can't really compare them to NECA much as I only have very few NECA figures, but the Legions have...mixed...articulation.
Right off the bat, their arms are their most limited point of articulation. With heavy armor and bulky torsos, they can only get so much range of motion in their single swivel hinge elbows and swivel disc shoulders. Figures with less bulk, like skeletons and especially the 2.0 figures can get more flex, but the bulkier 1.0 builds can have issues two handing weapons. Newer figures can often come with extra hands, and some include a vertical wrist hinge hand to help with this problem, but it's still something to note.
The next big Horsemen wave will feature traditional Knights v Skeletons, so it's expected for new armored hand options to come out with that wave that can be used on older figures.
Both the neck and the abdomen on the 1.0s and the upper chest on the 2.0s, have ball socket joints. Most get great range of motion from these and can allow for very expressive posing, but again, dudes in armor can only bend so much.
From the waist down though, it's another story. These guys have just great ranges in every joint, with the weakest being the single hinge knees which can get 45+ degree bend. But all the swivels and hinges and huge ball swivel ankles give their legs a lot of freedom. They were designed with mounts in mind, and they have no problem saddling up convincingly.
In the end, these guys are not Revoltech/Figma tier hyper articulated crazy figures. But what they do have is solid, sturdy, better then most western figures (imo) and enough to get a lot of fun out of em. Considering they were designed with part swapping in mind, their articulation is fairly solid, but there is certainly room for improvements.