If you have the choice, take the 2017, it will be supported a while longer and is more current in terms of hardware.is there a big difference in performance that’s noticeable in day to day use between the i5 2015 MacBook and the m3 2017 MacBook? i love my 2015 but it is relatively slow and i’m tempted to get a 2017.
LG Ultrafine 4K (now) supports 60 Hz on the 2015, according to Apple:I had the 2015 and the bought a 2017. there is a noticeable keyboard difference and the HZ rate is only 30 vs 60 with 2017 when plugged into a 4k ultra fine LG monitor. I still use the 2017 daily. I have the full size iMac Pro magic keyboard and swapping between that and the 2017 keyboard it doesn't bother me much although obviously the iMac Pro keyboard is top notch. the 2015 keys aren't really good. way too flat. go for 2017 or not at all