I can think of a few outside of the ones you’ve mentioned.
*A mezzanine codec for proxy and optimized workflow (Both NLE’s have a de-bayering option but proxy can make editing in remote locations very easy).
*Auditions are a very unique and handy feature for X
*Smart Collections: Adobe just mimicked this with search bins but they are not nearly as powerful and robust as the smart collections in X.
*Round tripping with Resolve: While both NLE’s can roundtrip with Resolve just fine, with the latest updates X has a few advantages as far as translating speed changes, keyframes and even some plugin effects.
*The Plugin world around X: This is huge, because they built X around Cocoa releasing a giant plugin market that sprang up overnight not to mention the custom templates you can publish via Motion. Anywhere Apple is lacking, this market fills in the gaps.
*Keyword Collections: Another, very powerful way to organize media around metadata that is far more robust that the classic bin structure.
*Storyboards: Being able to pre-biz an entire film using placeholders before you ever step foot on set is a great feature.
*The Magnetic Timeline: This is maybe a matter of taste, but once you master the magnetic timeline the speed and ease of editing can be greatly improved. The fact you don’t have to worry about throwing clips out of sync is a huge deal. There are still some advantages to track based editing but those are few and far between.
There’s advantages and disadvantages to both, I edit with both NLE’s and I’ve slowly fallen in love with X. Premiere is a better all rounder but X is so forward looking that despite a handful of shortcomings, just makes editing a far more pleasurable experience.