The fight is a close one between these two phones as they have many similar specifications.
Be it the processor which is Samsung Exynos 9 Octa 9810 for both or the display or other, they have almost similar features.
But if it has to be chosen then the Samsung Galaxy S9 Plus may be a better deal because of it having a greater quality of the camera as described by the reviewers.
The aspects which make the Samsung Galaxy Note 9 a greater deal are its battery and better storage.
The Samsung Galaxy Note 9 has a battery of 4000 mAh whereas the Samsung Galaxy S9 Plus has 3500 mAh of battery.
Check Full Comparison: Samsung Galaxy Note 9 vs Samsung Galaxy S9 Plus
The OnePlus 7 seems to be better but the Samsung Galaxy S9 Plus is also great as it gives you the best in class camera and at a lower price.
So, it is the buyer's choice.
Let's see the specifications-
Processor: The OnePlus 7 comes with the Qualcomm Snapdragon 855 processor whereas the Samsung Galaxy S9 Plus comes with the Samsung Exynos 9 Octa 9810 processor.
Camera: The Samsung Galaxy S9 Plus has a camera of 12 MP + 12 MP with F1.5 aperture whereas the OnePlus 7 has a camera of 48 MP + 16 MP + 8 MP with F1.6 aperture.
Check Full Comparison Samsung Galaxy S9 Plus vs OnePlus 7
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