Yes, the AKM v2 comes with the updated remote control.
The NAD M51 was at one time a highly regarded DAC. I still enjoy listening to it and am fond of how it sounds. The reason I upgraded from the M51 was I knew it was long in tooth and the newer DACs had made leaps and bounds in the Signal to Noise Ratio realm (SNR). I listen with my ears for the most part, but the massive increase in SNR with modern DACs suggested it was time for an upgrade.
As to why I chose RME; it was based on the great reviews. RME has a phenomenal reputation with pro audio so I figured their gear would be up to snuff. As mentioned, I can do without all the fancy bells and whistles the ADI-2 FS offers, but it's a good value sound-wise at used rates (typically <$900 USD at the time of writing). With the rise of Audio Science Review and the legions of music listeners that prefer measurements over subjective listening preferences, I knew the Chi-Fi brands would be lacking in substance. In other words, cold and sterile. So that basically eliminated all of the new breed of Chinese crap. I was left with exploring the 'old guard' of audio brands, so to speak.
As with many folks in this hobby I spent hours upon hours researching DACs within my budget before deciding on the ADI-2 FS. I had also owned numerous pairs of speakers from PMC so I was familiar with vendors in the professional space that had crossed over to releasing hi-fi gear, and that's basically how RME framed the ADI-2 FS. A DAC built by pro audio specialists that could also function in the hi-fi realm without sounding clinical.