My 2 cents. I say the same every time the argument "i've had a £400 lenovo, replaced it with a £2000 mac, and the mac is just so much better" pops around, so here it goes.
If you are considering spending a grand on a used laptop, you get much more computer if you get a windows based one.
I'm writing this with a £500 used laptop that blows most macs out of the water in every single way except maybe looking cool at starbucks (sorry
) This laptop was around the 2k mark when new, and besides maybe playing the latest games at the highest settings (which i don't do) it does everything else flawlessly.
At times i'm doing video editing, 3d design/rendering, and photoshop all at the same time and i don't even bother closing one piece of software to open another.
The one drawback is, it runs windows, but only recently i had enough of it and switched to Linux which i was reluctant to do, and found it to be a really good decision and less hustle than i thought it would have been. Definitely recommended.
I run it as dual boot so i can boot to windows when i want to, mainly if i have to use photoshop as it runs like shit in linux. Best of both worlds really