The stillness of the fisherman makes the first image better and with a quick tweak in photoshop you can easily achieve the same detail in the rocks as there is in the second image. i gave it a go and managed it in about 15seconds using shadows/highlight in Photoshop CS.
Under-exposing a touch is always better than overexposing - with under-exposure you can often bring out the details in the dark areas but with over exposure, the details in the light areas are lost at the moment of shooting and cannot be brought back with post processing.