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I'd go with the '86 because of mileage and condition. Which tranny it has would be a minor point.
The G50 is more expensive to fix, more expensive to replace (if you ever need to), about 25 lbs. heavier, and has a 9:31 final drive ratio compared to the '86 915's 8:31. But, it's generally a little smoother shifting than the 915. Like Porsche Monkey said, you really won't know unless you drive them both. But even then, a fair comparison can only be made if both transmissions, clutches and shift linkages are in good working order. Many 915 shift linkages are not (a condition which is easy to fix).
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