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PVC will have better thermal insulation, require less maintenance and have better security ratings. Wood will allow you to wank on about your wood windows. Modern spenny PVC is nothing like the super plasticky looking stuff from a decade or so ago (better joints, gloss etc). So it depends on your preference. I definitely wouldn't go with Alu if it were me. They make heat sinks out of that stuff.
New windows, talk to me. I'm doing a full house refurb and am doing new windows. Got some quotes for Alu windows , and whilst not silly expensive I'd like to save some cost off. So I'm looking to see if there are any nice looking uPVC windows about. Any suggestions?