OK before I type anything, this is my opinion and I could be totally wrong as I have never driven a boosted car at its limits. However, I have quite the experience in drifting.
I myself would prefer the smooth curve because of the following. (Keeping drifting as its main usage.)
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Predictable power and not a spike out of nowhere. This can cause difficulty in controlling a drift and even while initiating. I’m almost imagining it like driving an automatic and you punch it and theres no instant power, until a second later and then BAM it comes all at once.
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If you fall out of the boost range and this happens often while drifting, you basically have (for argument sake) 1/2 the power you would have at full boost, while with the GT28, even if you’re at lower rpms, you still have 75% of the power there. Mind you, these are just approximate numbers as I am looking at these graphs.
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It will take more finesse to get used to as the spike seems to be very dramatic. More throttle control is needed and less error for mistakes. Yes throttle control is important, but why make things more difficult than it has to be right?
NOTE: I could be completely wrong, but from a drifting perpsective, that’s my 2 cents.