The S8+ has a slightly better feel in the hand IMHO. It is more like the way the Note 7 felt when holding it. That being said the Note 8 feels a little too big. Not by much just a little. I will get use to that however as I did when I got my first Note the Note 3. I went to the 8+ because it was close to the Note 7 when holding it. But it did not take long for me to miss the Spen. I've had the N8 for 3 days now and am very happy I Upgraded. Verizon made it easy for me to do so, which was a surprise for me, being that it is, well, Verizon.
No regrets no looking back. I do believe that Samsung could have done more with the N8, like no bezel top and bottom. But maybe with the N9. I always like the Note line as Samsung did more with it than the S-line. More innovation that might show up in the next S phone.
So to sum it up. S8+ great phone N8 even better. Worth the upgrade if you are a Note fan.