also is it just me or is posing in GMod better than posing in SFM?
This varies from person to person
Some ragdolls in Garry's Mod may have a limited range of movement or trashy physics mesh, the Source Filmmaker doesn't rely on physics, so you're free to do a lot more with models
Posing in the Source Filmmaker can be slow, but it can also be more precise, and you won't lose your place if you accidentally click on a body part, but posing in Garry's Mod can be quicker and easy to get the pose you want if you know how to work the Physics Gun, but you may slip up and accidentally unfreeze something you wanted to keep in place, then you have to re-adjust that object back to where it was