Pipe sounds better than the metal ones that are an inverted u shape with the sharp edges on the bottom as some commercial ones.
I still shudder at the horror of a rather wild work horse my Grandpa Calhoon had which got a foot caught and nearly cut it off trying to get himself out of the gate 60some years ago! And I didn't even see the horse, but hearing the shot which put the critter out of his misery was enough to give my then 7 year old self nightmares for a long time!
Great points on making them easy to remove for cleaning, too. Putting an alternative gate alongside for extra heavy or wide equipment, or for putting livestock through is a good practice, too, in many cases.
mrj