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When you spec out the TB 13" with 16GB RAM and a good size SSD, then the difference in cost fades away, so that for me the 15" has much better value with 4 CPU cores, a real dedicated
GPU and a larger screen. I find that the new form factor and lower weight makes the 15" very portable.

Yeah, I see your point. There’s about £300 in it which gets you a bigger screen, 4 cores and a dedicated GPU. Value is much better, still paying more though haha
 
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