If I were you I woud take the 15" not only because the performance is better but also because the screensize is quite ideal for both mobility and workspace (at least that's in my case).
I wouldn't worry too much about it's ability to run the game. (Especually when you have an ssd )
I have an IMac 27" i7 from 2011 and I can run gw2 smoothly Maxed out and a mbp15" core2duo from 2007 where I can run the game smoothly on low/medium.
I also found that you will gain a big fps boost when you run gw2 on osx instead of bootcamp since the graphics cards on a Mac are used as a normal processor and help the I7 out while it's doing less work vs the I7. In a game like gw2 that relies highly on processor power this makes a Huge difference.
On the price of the machine you have to keep in mind the price/quality of both.
You could buy a plastic box for 1000€ and have the same power but carrying something like that Around might affect it's lifespan,
A fully alluminum mbp might be the better option then.
EnektricMember Since 29 Oct 2012
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