I'd say my old favorite was when I got the NAD 2020 integrated amplifier about 45 years ago. I wish I still had it but changed to an Adcom 5400 amp about ten years later. Current favorite piece is Watkins Generation 4 speakers (prototypes labeled "custom design" with Bill Watkins name underneath). Before those speakers, I had Watkins WE-2, a smaller version of the massive early 80's WE-1. I was also quite fond of my old Grace F-9E mm cartridge which was used with the NAD years ago.
What's the best and/or favorite piece of equipment you've owned? And do you still own it?
My favorite piece(s) are (and I still own them) the Martin Logan Ethos lousdpeakers and Soudsmith Paua cartridge. As far as speakers go, electrostats are my favorite and will replace them with another set of electrostats. I'm currently eyeing MUR Audio SP1's. These two pieces make my rig sound great.