I’ve been using a couple pi 3 and 4 but now as I’m giving into plex more and cutting the cord (dvr software) the pi’s are slow (can’t transcode). I see the nucs but if become too fond of Linux. I see $400 qnap etc nas can run my software but I feel like I’m overplaying for the nas, which i don’t want. I guess im looking for a “arm nuk”
Nuc with Linux, Synolgoy NAS? Depends on what you plan to do with your next step up? I invested in a Synolgoy based on the Intel vs. ARM for more compatible Docker containers to run pi.hole, EMBY and other items. My old pi's are now just lab boxes to test things out before they go on the Synology.
For me it depends on your expertise and openness to change. Certain platforms may be better suited to certain tasks, but, for me, I wanted to support of countless articles and the experiences of others to assist me in making the leap to acquiring my first rpi. Granted I had base-level experience in using Linux for work in a previous job, but it was still a step up for me in some respects. If you are comfortable branching out to a different platform, then kudos for taking that step...
Google is your friend for these questions. As stated there is the core CPU (ARM, x86, etc.) and then the operating system that supports that architecture, then the add on software that needs to support the OS on the CPU. Most projects support the mainstream OS's and their underlying CPU/instruction sets.
Need to know the model number but I would say that even a entry level Nuc is faster at most tasks than a Pi and supports a faster IO bus networking and disk.