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With a steel pier it is all about wall thickness. One of my piers has a wall thickness of 13mm and as a result it is extremely rigid. If you knock it there is no vibration whatsoever visible in the scope. It does not ring at all. It is bolted to a 2.1 ton block of concrete. My preference is for steel over concrete.
Pouring concrete in a tube can be difficult. Remember to tap the side of the tube with a rubber mallet lots while pouring the concrete if you go down that path. This will remove air bubbles. Better still hire a vibrator to vibrate the concrete. It will give you the best chance of doing a good job with concrete.
Steel is better in my opinion.
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