The second trailer is better than the first. I like how you still don't get a full shot of Godzilla. In the first few Alien movies, you don't get a very clear shot of what the entire xenomorphs look like. Later, they showed you more and they were less scary.
I find this Godzilla terrifying.
And Cranston's voice over is awesome. To quote the meme going around the interwebs: Godzilla is the one who knocks!