I've had recent problems with Roon remote, none with Core. My issues with running remote came from outdated Roon remote app with Amazon Fire OS. Switched to Android tablet no problems, only issue now is album library no longer in correct order. Hoping continuous reboots will correct this issue.
Hear no difference in sound quality.
Another thing to keep in mind, at some point updates of Roon Core may cause instability issues with some older computer OS.