Price, as far as i know, but according to an friend, who used to be an installer, it is a bit early in their life to judge the composite doors duability or lifespan.
The composite ones usually fade to an interesting dappled pattern in the sun, especially if they are red or blue. Composite is probably more secure than uPVC but the front door isn't the usual entry point for thieving toe rags unless you leave it unlocked. There are different qualities and prices available in both types.
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