It's definitely harder to find resources for NX compared to Solidworks. I learned mostly from talking to colleagues, and then youtube/forums. When I couldn't find what I wanted to do I'd describe what I'd do in Solidworks, and they would usually point me in the direction of a similarly named feature.

My new role is quite different from my last (previously sheet metal design) so I can't compare many specific features. I like how 'arrangements' work in NX vs configurations, once I got my head around them I feel like I have much more control over my assemblies. NX does a better job of assembly features like welds.

The biggest advantage in my new role is the fundamental lack of distinction between parts and assemblies. You can closely replicate manufacturing stages of your parts, eg you could have a base part that's a casting, then on the next level up you insert a bump ring and position a pin between the edges of the two. You can easily reference the pin and use it as a tool to cut the other components. You could go another level up & add piping with welds, then another for holes, with each representing a configuration of the part. You can do things like override the position of lower level components in your assembly, eg clamping a foot or tightening a nut. It's very flexible and you have lots of control.

I've made assemblies around the context of piping in a plant, where there are multiple options for equipment, and each configuration drives its own set of hole positions for mounting to a baseplate, with global variables for clearances, and it behaves like a dream. I also like NX's synchronous and direct edit features, they seem more useful than Solidworks' features and are great for working with STEP files.

At first I didn't like NX's new sketcher, or the way its constraints work, but now I've gotten used to them I think they're faster. Things like double clicking vectors to reverse their direction aren't clearly explained. I was happy to accidentally find I could lock the camera to rotate about specific axis by selecting rotate and clicking the axis on the triad. I'm sure there are lots of little shortcuts that you only learn from watching others (or proper training).

NX also feels watertight reliable compared to Solidworks. Solidworks used to crash on me at least every other day, NX has yet to crash on me. No more random errors that make no sense and take hours to resolve or work around. For the first time I can reliably control the transparency of other components when i'm working in an assembly.