Interesting replies, I'd go with the second but....
On the second I find the grass especially to the right and top right distracting
I'd crop more central (animals within an imaginary oval) and pp a fade to black at the edges, I don't mean a vignette though.
I think that's probably quite an old fashioned style but I think it would work for this subject
Consider how it will look within a mount and frame
If your going to print big, worth a test print to make sure you've got the pp right on the lambs
Love the pic, deserves a big print
Those lambs are just too cute!