Both phones have a different operating system. Both have a smart and sexy design that was not found in any other phone.
On comparing both these phones I found that both phones have their own special qualities. Like you not get a display like Galaxy Note 9 display.
iPhone X have hexacore processor while Note 9 have an octa-core processor. iPhone X have not any fingerprint sensor while Note 9 has a fingerprint sensor. iPhone x has 3 GB ram and 64 GB rom but in Note 9 you get a 6 GB ram and 128 GB rom. Note 9 have dual sim slot but iPhone X have a single sim slot. Now rear camera quality of iPhone X is much better but front camera of Note 9 is more impressive.
Finally, price vise Galaxy Note 9 is more affordable as compare to iPhone X price. SO, In my opnion Galaxy Note 9 is much better option then iPhone X.