A lot of news about the Note 9 has come out the last couple days. It's sounding like finger print sensor under the screen as well as being released a couple weeks earlier too! Greggles hinted at 8gb ram but I doubt that lol.
Anyway, overall with under screen finger print sensor and possibly shipping mid august instead of early sept, I'd say right now to hold off, at least until more leaked stuff comes out regarding the Note 9 before buying the s9 plus.
The Note 9 will probably be a lot better than the s9 plus and then you will kick yourself for buying the s9 plus.
I'll sell the S9+ and buy the note 9