Hello,
Glad to hear you are enjoying the H90. I don’t think you’d notice much of a difference when using the R2016 vs the SP2016 Reverb on the H90. I would not say there may be a subtle (not a substantial) difference. It’s more of a question of workflow preference since the rackmount would be a dedicated reverb unit.
If you are mainly using a DAW, SP2016 Reverb is also available as a plug-in that you can try for free: https://www.eventideaudio.com/plug-ins/sp2016-reverb/
