Linux will spend less space and mainly less hardware to be able to run.
But when it comes to computers I always advise when to buy to spend more. However, you will have a machine that will last for years. It all depends for what purposes you intend too.
I have at home (which is my brother's now) a Core 2 Quad from 2008. At the time I bought it with a nice video card and 4GB of ram.
A machine that runs today and would run windows 10 if necessary.
Of course, if I were to use heavy programs, she was no longer good for about 5 years + - in any case, she is still functional, mainly to stay here at HIVE for example.
If it is something that I will do in the next few days, I have been opening my eyes a little more regarding this operating system and it is already definitive that I will abandon the window system, and I will change to the side of the penguin!