IMO, the Google lock screen is better. Observe the contrasts that make for easy readability.
I wouldn't think that trying to read thin, white colors on a light blue background in the sun would be a pleasant experience.
I disagree, the Samsung screen has a lot of issues:
-the text is in all capitals for no reason in the Google version, that's harder to read.
-the text is too small, again, harder to read.
-the 12 is in bold for little purpose, there's a reason most clocks aren't like this in real life.
-there's not enough white space in the black bar around objects, why scrunch them so tight.
-the clock appears twice, duplicating info, which is pointless.
-they shorten the name of the day when they could easily fit in the whole word, what for???
-the signal indicator is difficult to read.
-the battery is vertically placed when it makes more sense for it to be horizontal given the real estate in the black bar.
-the bluetooth icon is not really necessary.
-the natural location for the eye to first hit is the top left hand corner, where there is conveniently no information at all.
-the background graphic is uglier.
-the number spacing isn't attractive.
etc etc