It’s extra of a rigger/animator desire than modeler. The 2 poses have some tradeoffs to one another. The A pose is about making the characters bend and deform as naturally as potential. It reduces UV stretching across the excessive deformation stress factors as a result of the mannequin’s arms are a lot nearer to their resting place and don’t should rotate as far. A poses have angled arms and infrequently barely bend the elbow as effectively, which signifies that the arm bones are just a little harder to rig.
T poses require extra edge loops across the excessive deformation stress factors like shoulders and hips to be able to maintain them from getting too ugly when these bones transfer too far. That is completed to counteract the UV stretching talked about above. The good thing about the T pose is that it’s a lot simpler for the rigger to align the bones as a result of the arms are in a straight line parallel to a significant axis. All the things traces up rather more simply and cleanly alongside the main axes with no need to do extra work.
In the end, the variations are small and as much as the animation management’s preferences. Some want it a method, others want it the opposite, and numerous instances a venture is simply going with it as a result of that’s the way it was began and there’s been an excessive amount of tech work completed to modify to a different and should redo all of it.
PS. These variations additionally apply to the rig’s default leg positions. Straight down? Angled? If angled, how huge an angle? And so forth…
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