I have a Brodex Pro-long Aluminium 25ft, 2 x Xtels Fibreglass 17ft, and 1 x 45ft Carbon Fibre SL2, 1z preditor 18ft, Aluminium can be heavier or lighter than glassfibre it depends on the manufacturer, carbon fibre is the lightest/stiffest material for wc'ing.
For under 20ft I recommend glassfibre, above 20ft-30ft either Hybrid ( Glass and Carbon ) or Carbon fibre, above 30ft, it has to be Carbon fibre, in my view. I would get the 25ft ( 30ft use ) SL-X from Gardiner pole systems, its Carbon fibre, light and stiff and has small sections, Luke