The Note 9 prototype that popped up on GeekBench was pitted against the S9+ and it ended up a bit behind in both single core and multi-core tests. However, the Note 9 featured in the tests comes with 5 GB of RAM instead of 6 and it is powered by a Snapdragon 845 SoC which is known to be slower than the Exynos 9810 SoC that comes with the non-US versions of the Galaxy S9/S9+.
https://www.notebookcheck.net/Samsung-Galaxy-Note-9-GeekBench-results-and-specs-surface-online.293254.0.html