Hi Colin
I think match fishermen use carbon fibre and fibre glass net poles and there is tremendously wide range.
Game anglers tend to use aluminium net poles.I have five aluminium landing nets for river, bank, and boat fishing.Effectively, short, medium, long reach, and salmon. I do have an extending three section aluminium landing net that will do three jobs. It extends to 7'.6" and has a large capacty net.
I think landing nets are personal and like rods should be chosen to suite the person and the type of fishing they do most.
BK