Which of these macbooks should I use for Penetration testing?

Hi there I have 3 apple laptops with broken hard drives that I am going to replace with 2tb ones I would like to turn one of these laptop's into a mobile Penetration testing computer for wight hat hacking I will be using Kali Linux as my new operating system I was wondering which MacBook should I use here's the specs of all 3 MacBooks "https/goo.gl/xA0sJo" "https/goo.gl/uK8gFj" "https/goo.gl/s1rwWm" I will probably not use the The MacBook Pro 17-Inch because its a really BIG computer so that levees me with the Apple MacBook and the Apple MacBook Pro The Apple MacBook has a dedicated NVIDIA GeForce 320M GPU and a 2.4 GHz Intel "Core 2 Duo" CPU but the Apple MacBook Pro has a 2.4 GHz Intel "Core i5" processor that's a much better CPU then the 2.4 GHz Intel "Core 2 Duo" but the Apple MacBook Pro has a cracked screen that still works and it also does not have a dedicated GPU like the Apple MacBook I think the Apple MacBook is the way to go but the 2.4 GHz Intel "Core 2 Duo" CPU scares me will Kali Linux and other Penetration testing Distributions lag on the Apple MacBook or should I just go with the Apple MacBook Pro and get the better CPU any help is greatly appreciated thx - djcjf