I'd also say it depends on how you'll use the computer. I've got a three year old 15" MacBook Pro, and I've got a 3 year old 13" MacBook at work. The main differences, which seem to carry through to today's models, are the size, screen, and graphics card.
The smaller computer is definitely nicer for carrying around every day, but I find the larger screen to be much nicer to work on. I don't know if you have a preference, but I much prefer matte/antiglare screens to the glossy ones, and matte is only available on the 15" model. The other difference is the graphics card---the 15" model actually has two graphics cards (you can turn on the ), while the 13" only has the slower of the two cards. If you'd want to play graphics-intensive games, that'd be a point in favor of the 15".
Good luck with whichever shiny hunk of aluminum you end up with.
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The smaller computer is definitely nicer for carrying around every day, but I find the larger screen to be much nicer to work on. I don't know if you have a preference, but I much prefer matte/antiglare screens to the glossy ones, and matte is only available on the 15" model. The other difference is the graphics card---the 15" model actually has two graphics cards (you can turn on the ), while the 13" only has the slower of the two cards. If you'd want to play graphics-intensive games, that'd be a point in favor of the 15".
Good luck with whichever shiny hunk of aluminum you end up with.