For me, it depends on how long we're trotting and what we're doing during it. If I'm going to trot for 3 minutes circling various cones in various directions, I sit the trot. We're turning every 5 seconds or so, it isn't going to last forever, and I can use legs cues as much as possible.
If we're going straight, or for a longer time, then posting makes more sense. However, a western saddle will distribute the impact of the sitting trot over a larger area of the horse's back. If the saddle fits right, it won't bother the horse. If, OTOH, you have long quarter horse bars on top of a short backed Arabian, your mare might get pissy. No need to ask how I know...
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