I told her faster was easier! LOL!
It is with Bay. His stride is really long I feel like there are too many seconds of air in between to post gracefully unless he really moves out. I have to pause too much. In fact, unless I open him up into his endurance extended trot on trail, I sit it.
I was thinking of the way some horses have a "pony trot" - very rapid in rhythm, but very short and up and down like a sewing machine. That's almost impossible to post to. A slow trot BUT with good impulsion seems to me to make the motion larger and easier to find. But that's probably because my mare has a very, very smooth stride but not particularly long.