1. The “Loose Joint” sex doll couldn’t hold a pose. The “fixable” joint seems to be more like a “Medium” joint in terms of tightness. It doesn’t require a lot of strength to move that kind of joint but it still manages to hold poses very well. For the tight-jointed dolls, you’d have too much trouble moving her limbs around.
2. If it’s your first sex doll and you have any ideas that you’d like her to stand, please choose tight joints and standing feet. You will be shocked by the force required to move them, but it will be nothing compared to moving around 80-100 pounds of jello with no stable center of gravity.
If you want a bed companion that you aren’t interested in standing or posing dynamically, go with loose. Or normal, which will become loose soon enough.