Please explain why MACbooks don't face noise, whereas windows laptops do
Who told you that nonsense? The fans in MacBooks can make just as much noise as fans in Windows based notebooks can.
There are many many factors that can affect how much noise any particular computer makes. Different makers use different types and quality fans. The ambient (room) temperature matters, as does the other hardware inside the computer and the tasks the computers are doing at the time. Plus, the cleanliness inside a notebook can make a huge difference in how fast the fan spin, thus how much noise it makes.
And note Apple makes several different Macbooks and there are several 100s of different Windows based computers from dozens of different notebook makers currently on the market. It is hardly fair to compare one of each and then make a statement that implies all Windows notebooks make more noise than all MacBooks.
Is it true that better processors generate less heat?
Yes and no. But for that matter, "better" is a very subjective word. Better to one person might mean more efficient. Better to another may mean it consumes less energy. Better to another may mean faster, or has more cores.
If two processors are identical in every other way, the one that generates less heat doing the exact same amount of work in the same amount of time while consuming the exact same amount of energy could be considered better. But that is not a realistic scenario.
It is true, as a
generalized statement, that Intel CPUs consume less power, generate less heat, and have better performance than AMDs. But (1) there are exceptions all around and (2) AMDs generally are significantly less expensive.
I also get the impression that windows 10 is rather unstable, and uses a lot of CPU power.
What? This is more nonsense. Windows 10 is the best, fastest, most efficient, most secure and stable Windows yet -
on hardware designed for Windows 10.