13, 15 or 17 - which has most uptake

so curious size mbp popular mbp buying public.
...i don't mean favourite, or have if budget unlimited,....just 1 sells more.
please vote model have.
in advance response.

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btw, newbie, option create poll when add new post?

 

why buying resell value? determine needs , buy best 1 fits needs. since doesn't seem need beyond entry-level 13" mbp i'd suggest or macbook air.

 

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