We normally refer the T-I as steamer because the propulsion is generated by steam, the T-II as electric, as it's propulsion is electric.
The "steamer" has longer range but leaves a wake, which is easier to spot.
The way the game is structured, you can load any combination of torpedoes you want. Personally I load all electrics in the belief that my position will be more difficult to ascertain.
Good hunting!
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