@Jim_B
To quote from my Guide:
DISCLAIMER:
I DO NOT AND WILL NOT release any of my macros to the public because they’re tailormade for me, my playstyle, gear, Talents, latency, etc. and you WILL get sub-par results. Macros are NOT one-size-fits-all. They’re not cookie-cutter. What works for the macro creator, you or I WILL be different.
Which Class/spec has the best macro?
Macros that works flawlessly for me would not inherently work for you unless you both play and are geared similarly to me. It is based on you, the macro you wish to use, and your character. With any sort of precision, there is no way to address this.
The best response to this is the class you know how to play without a macro in fact. With this in mind, you both know what the character should do and can look at the macro and make the required changes.