Had the RME ADI 2fs with a Teddy Pardo LPS which was a nice setup. The Teddy Pardo definitely improved a pretty good DAC. I ended up trading my RME/Teddy to TMR when they were selling refurbished PS Audio DirectStream MKI’s with a one year warranty. I would say PSA is in another league and very happy with the upgrade. You can probably get a DirectStream MKI for around $1700 in great shape no problem and maybe less.
The DSD MKI is going to have a fuller, more refined sound. Top end is there but not at all edgy/harsh and will extract more micro detail than the RME. The bottom end has a lot more weight and even with the Teddy Pardo. It’s hands down a better DAC and should being 5X the price when new. I can play it for many hours and never get tired or fatigued.
Would strongly suggest looking into a DSD MKI. Warning though as with it’s improvement I ended up buying a PS Audio AirLens and just recently their current PerfectWave SACD Transport with both connected with the I2S HDMI cables.
Good luck.