the second one is olive egger- his comb is pea which is closely linked to the gene for blue/green eggshells.
first rooster is single combed and more than likely does not have the blue/green eggshell gene.... unless he is marans mixed with legbar which don;t have the pea-blue eggshell linkage.
if you dont know their history and you want more green eggs, use the second rooster.
wou;d be better to use pure marans, welsumer, penedesenca to cross with for olive eggs.