4x4? Ugh. Noob. 5x5 is minimum if you wanna be cool.
About the methods: Remember, the fastest guy is always right. Which is me. So centers first for the win!
I haven't really put much thought into the "LBL" method. Getting the top row clocks aligned is simple, but then I'm screwed. How can I add more clocks while keeping the top row clocks aligned? I have no idea. And Mitchell's videos confuse me. I think he starts building the first two rows together, but it looks complicated.
Seriously, go to 5x5 right away. 4x4 is almost as annoying as 3x3.