No, it is pure personal opinion.. If you can guarantee that all your papers will be in order and you get the award... Go ahead and apply from outside. Myself I had to leave the UK back in May and apply from home because of the maintenance fund. I did apply after three months and got my PSW in one working day. However, I have done all my best to provide all they needed.
Another point, if you are after Indefinate Leave to Remain (after 10 years) going home and applying form there will reset the counter to zero. At the end of the day it is your choice.
Assuming you want to apply from outside, please refer to this link and read it carefully:
http://www.ukvisas.gov.uk/en/howtoapply ... tstudywork
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