[atombender]

The 2015s are great, but be careful — the high-end models used to have a fast, discrete AMD Radeon graphics card, but they quietly stopped producing these, in around 2017-2018 [1].

These newer models have an Intel Iris Pro integrated GPU. It's a big step down in performance, especially noticeable if you connect an external 4K dispay or use the Retina display at non-uniform scale factors. The Radeons supported resolutions up to 5K, Iris maxes out at 4K, apparently.

I discovered this when I spilled coffee on my 2015 MBP and had to get a new one, and I nearly spilled my coffee all over again when I saw that the discrete GPU was missing.

[1] https://support.apple.com/en-us/HT204349