Retina display: 13 ins or 15 ins macbook?

Question

With the educational discount, similarly specced 13in and 15 in Macbook Retinas are the same price; I prefer the smaller footprint of the 13in, but wonder whether the quad processors, larger battery, and potenatial for upgrades would make the 15 in a better buy.
I travel quite a lot, and don't game much, but the machine would be used a lot. I've also noticed that my current 13in MBP (2009) gets quite warm in use, don't know whether the larger processors working 'quietly' would be better than the dual core working their little socks off
Any informed opinions?
Thanks
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Answer 1

My sense from the little I have seen is that nothing will be upgradeable on the 13 in (the order form even states you should think carefully about RAM as well as Flash memory, as once it's done, it's done), but am I right in thinking that most things are upgradable on the 15in?
I assume, BTW, that even on the 13in, one could replace the battery once it's packed up (assuming one keeps it so long). My three year old 13in MBP now only lasts about two-three hours on battery alone...
Like you, I'd prefer to see the reviews before deciding; my constraint in the educational pricing, which would save my up to 20% over retail (the three year warranty is a lot cheaper through Universities, for some reason).
Regards
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