what too look for in the way of options,2010 or newer 4 x 4 avalanche

I'm looking into the idea of purchasing a 2010 or newer 4 x 4 avalanche,
now the last avalanche I owned was a 2 wheel drive 2003 version,

what can you tell me / good or BAD,
about the newer versions and what too look for in the way of options,
engines, transmissions, etc, too avoid or look for?

Here is alink from Brian R. For ya Grumpy
https://en.m.wikipedia.org/wiki/Chevrolet_Avalanche

thank you.