Admob: 6.4.1 and Google Play SDK

What is the difference between these two SDKs for admob?
The 6.4.1 and Google Play SDK…

I heard 6.4.1 will no longer be supported by August, 14.

yes waiting for some nice library to come out which makes integrating play services easier. I hate that builder thing in services sdk.

I have tested and started to use Google Play SDK in my app/game, for ads it 's just bigger size and you must spend your time to make it work with apps.