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Depends on what generation you get of either engine. 3rd generation 3SGTE's were only available in japan, and they make 240 BHP. Your common garden variety 3SGTE puts out around 200-210 BHP and torque. Depending on the year of the V6 and the car it came out of, you're looking at anywhere between 190-215 BHP, and usually a tad more torque.
The 3SGTE would be "easier" to install per se, only because you'll have an easier time with the engine mounts and finding drive axles. The V6 swap requires more fabrication which add to the difficulty.
As far as the overall potential of both motors, I'd have to say the 3SGTE has more potential for big output. Not to mention cheaper and easier to achieve more power with it as opposed to the V6. The main thing to keep in mind with the V6, is the practically everything you do to it will be custom, that includes getting more power from the motor.
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