A pose is better because it gives you good deformation in the standard range of motion (idle, walk, run). In AAA games like Tomb Raider they use correctives for poses that deviate a lot from the bind pose like climbing, kneeling or what not. With T pose you’d have to use a corrective for almost everything if you wanted high quality deformation but I guess it’s a bit more versatile if you can’t use any correctives at all.