I ended up liking the A350 suites better overall, but I wouldn’t turn down either of these seats. My main complaint about the KE Apex is that the divider between your seat and your neighbor isn’t 100% effective, and the seats aren’t nearly as private if you aren’t in the window. The window seats are quite nice, if you can snag one.
I think the bed is more comfortable on the KE Apex, but the privacy is better on the DL A350...
Agree with most of the other assessments, other than to add that KE’s alcohol service will be unsatisfying to many FT’ers - the wine in particular is dispensed by the thimbleful, and I’ve gotten larger pours at most wine tasting events than I do onboard with KE. I don’t mind because I’m usually on a mission to try everything rather than consume a lot, but others may feel differently.