[stomachmonkey]

Actually the 2015 box comes with an AMD Radeon R9 M370X.

All Mac laptops and a lot of Windows laptops come with two GPU's.

On Macs one is an Intel run of the mill card while the other is a higher end AMD.

They dynamically switch based on load and power. When on battery with a light load they'll use the low end low power Intel chip but when you do something that puts a load on it will switch to the high end card. When plugged into a wall they'll pretty much always use the high end card.

Photoshop will use the GPU for tasks so it is a consideration.

The difference between the two AMD cards is minimal, the only place they really differ is video composition where the 450 is about 50% faster.

FWIW I always spend the budget on laptops, buy as much as you can afford but my requirements are generally higher than the typical consumer.

She'd be fine with either box so it really just comes down to a) save $300 b) deal with adapters.

I think in her situation the 2015 box probably fits the bill better.

EDIT: One thing to consider, Apple end of lifes a product 6 years from date of first sale. Meaning if she keeps it a long time and it breaks after 6 years they will not fix it, goes out to a 3rd party repair facility. Not a big deal, just an FYI.