I think you will be really happy with HDR performance on both.
I ll try to help. Tested both.
x900e + better motion handling (?), no trailing, really fast panel for gaming, FALD
- no Dolby vision, some blooming on credits and sometimes into black bars
x930e + double picture processing, DV coming with update, brighter for HDR (not by much)
- trailing, occasional judder, edge lit
Not sure paying more for 930E is a good decision in a 55 size, you will hardly see any different picture wise.
1st 55js8002: Bad DSE - returned for replace
2nd 55js8002: Exactly the same thing - refund
55js9002: Panel R.I.P. (edge bleed after 1 year of use) - refund
55x900E: Great TV - hope it will last