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@Tjuice
31trum: rear sprocket will turn ~3 times for every turn of the front (assuming something similar to a 48 front, 16 rear), so you would expect it to wear out 3 times quicker.
Malaysian: Alloy will wear out quicker than steel, but you are right, it is lighter (although that would not be my deciding factor given the extra weight I carry around my middle...). I asked myself the same question about alloy vs. steel on Monday this week, and figured I would go for steel this time because I tend to accelerate pretty hard, and (over time) do tend to deform teeth on alloy chainrings.
The key advantage of alloy (from my perspective) is that you can get some cool anodised colours. Was very tempted by the gold ones available from Velosolo and also some of the other colours you can get from Charlie the Bikemonger.