attic ladders and storage

Hi,
I have received 2 quotes for attic ladders to be installed including flooring for light storage in my roof space.
Apart from $600 difference in cost, the major difference between companies is that one supplies a timber ladder and the other supplies aluminium ladders.
I have 12 ft ceilings.
After then doing a bit of research, I find no other company (besides the one in question) recommends timber ladders due to weathering, weight etc. I wonder why this company has suggested timber? They are the more expensive one but they do seem very professional and organised and have been around a long time.
Does anyone have anything to suggest here?
Thanks


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