You won't be getting the SD chip if you buy the Note 9 in Malaysia. You get an Exynos 9xxx, can't remember the number.

The performance is similar to the SD except it loses out in the graphics performance. The advantage is it is more power efficient.

At the moment, top Kirin/Exynos/SD chips don't have much performance difference between them if you're using it for gaming and daily tasks. You'll only see the difference in benchmarks.

I think the Kirin processor is touted for its AI capabilities. Never read up much about it.