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Gears are important. Metal presumably should last longer than plastic, long term it is likely that the batteries will be the limiting factor with lifespan.
I bought the De Walt drill and impact driver from Screwfix recently and am very pleased with them. I got two 4aH batteries in the pack which are brilliant. I just hope the batteries last. I just had a look at the Screwfix app and am struggling to see the set I bought - as mentioned above, there are a lot of variants.
Metal gears not that important for standard DIY jobs? @TGR