This is a pretty simplistic question, google would help you out.
I go with a manual for a number of reasons:
-Generally lighter
-Less parasitic power loss=better mileage, usually faster than some automatics.
-I love shifting my own gears, so I can use the engine to brake and don't have to wait for the trans to shift down coming out of the corner.
However, automatics are often easier to package because you don't have to worry about shifter location as much.
Newer generation transmissions are pretty good at gear managment, they often are comparable in efficiency and acceleration to manuals these days.
Automatics generally can handle more power, and are easiler on the rest of the drive-train.
More consistant shifting for drag-race applications.
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