The Samsung Galaxy Note9 has outscored the Galaxy S9 phones in the DxOMark test, earning a respectable 103 points (tied with the HTC U12+).
The Galaxy Note9's autofocus proved more consistent and better at tracking moving objects than the Galaxy S9+. The dual OIS system was also found to be steadier. Here's a quick comparison of the scores:
Huawei P20 Pro
Samsung Galaxy Note9