You will not be able to read the AW or AWS1 face in bright sunlight. You will have to shield the display, and it still may not be possible to read small 'print' if not completely shielded or standing in a shadow.
From what I've read, you'll be able to read the AWS2 in bright sunlight, but the display won't be bright.
The AW and AWS1 displays are 450nits and the S2 is 1000. So it's a little more than twice as bright, and it's still not 'bright' in sunlight.
You have 14 days to return an Apple product to an Apple Store (assuming you purchased it from Apple. Other stores are probably more generous (as in 30 days).