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In real life it had wider angle of view and allowed more light in the periscope. Unlike the attack periscope it's capable of viewing above the sub and searching the sky for aircraft. It can perform this function in the game too.
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Sorry to play smartass here, but both attack and observation periscope had the same field of view and zoom levels. The chief difference was the size of the head, for reduced chances of being spotted in the attack scope versus the observation scope, and hence the light transmission level. The attack scope offered a darker view because of that lower light admission when compared to the observation one, but no other differences existed. (Well, the observation scope admitted a binocular view thanks to an auxiliary prism whereas the attack scope didn't, but that depended on models)
The ability to use the observation scope for scanning the sky upwards -which the attack one couldn't do- is correct
In real life the commanders used the observation scope for submerged attacks:
1) At night
2) At day when they were still far from the target (Say from 4-5000 metres onwards). This allowed better observation of the details of the enemy, plus keeping a better watch for aircrafts. Once they were getting closer than 4000 metres, they switched to the attack scope and used it sparingly.
This is also the reason why the graded reticles in the scopes were different, the attack scope one having less divisions because of the shorter distances it was meant to be used.
