More gears in the same space is the complaint about the 6 speed, but not in terms of strength.
The S15 6 speed is a close ratio box... meaning its 6th gear is not much taller than the 5 speed's 5th. More gears in the same amount of space. Driving my stock KA I never find the revs dropping too much on an upshift... it's never hard to keep the car in the powerband. I don't need closer ratios. An SR with the stock turbo shouldn't need them either, and reviews of the S15 seem to support this.
Now a high winding NA engine or an engine with a big turbo that spools slowly might need those ratios... Which is exactly why Autech used the 6-speed in their version of the S15 (200hp NA SR20DE).
If you have to ask "which is better for drifting" then there's clearly a lot about the subjects of both gearing and drifting you have left to learn. The answer is highly dependent on particular car/engine combinations and your own personal driving style.
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