It's simple then. If you want mac, you already did narrow the selection to one manufacturer. Apple don't have many models in paralel so it won't be hard to choose specific model.
Yeah, but macs are not powerfull as some windows models and heat a bit more but aren`tthey smooth.
Well, if you prefer mac os, you definitelly have a reason to do so. What is it? Can you easily switch to Windows?
What does it mean - powerfull? I have some 12" Dell refurbished with some embedded Intel and Linux onboard and it is powerfull enough for my needs. Do not ask yourself which laptop is more powerfull then other, rather ask yourself which one is powerfull enough for your application.
And of course - there are lots of very important properties and features other then performance.
I want to buy the better option because in future when i need performance i will have it.