You’ve got to try both IMO... the Hegel really is a great performer. As mentioned, servicing a 10yr old Gryphon might be an issue. Not so much whether it can be serviced, just a possible challenge. Look at the specs too. Which suits your needs best? The Hegel wraps a fair amount of goodies in their chassis, the Gryphon would be without. Buy the Gryphon, not many of those around. Audition them side by side. Hegels are new, and although not a dime a dozen, they are avail pretty readily. Though you don’t see a lot of 390’s used typically.