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Increased friction and some compression down a longer length of cable lead to sloppier shifting. But in practise it isn't an issue on MTBs or CX bikes which run full outers to keep off mud and wet.
If it's an all weather bike, full outers will mean you need to change your cables less often in exchange for a maybe imperceptible reduction in shifting precision
I have to choose the cable routing and i need some help. I decided for external one because internal seem a useless fuff but i don't know if it's better to have a regular road routing for shift or a full housing from shifter to deralleur?