You fell into the same trap I nearly fell into when I wanted to 'upgrade' to the O1Wfd from my beloved Korg T3EX.
When the O1 came out, I though- hey this thing fixes the limitations of the T3 like only 16 notes of polyphony, some real time fx control and a 16 track 'slightly better' sequencer.
But after spending a day in 2 music shops playing the 01, I decided to keep my T3- why, because whilst the 0 series were an update to the T series, I felt that my T3 sounded 'better'. The same waveforms in the O1 did not sound as good as the T series waveforms and some of the T series drum sounds were way better than the O series sounds (and actually found their way back into the N series instruments!!!!!).
So I kept my T3 and was glad I did- not that I'm daming the O1W- the opposite in fact- it's a great board even to this day!!!!
But the X and N series were introduced after the O series claiming to be the 'next big thing' by Korg but in fact their sound was even less 'ballzy' than both the O and T series synthes. I played an X3 and thought 'this sounds shit!'. Likewise for the N364 and N1R which I tried out. Yeah, the N series give you an arpeggiator, more real time control, more polyphony and more waveforms but their operating system leaves alot to be desired compared to the O and T series and they sound just so much 'thinner'!
I myself would have kept the O1Wfd but really you've got your N364 now so make the most of that- or go out and buy a Triton (which wipes the older Korg synthes dry!!!!).