What speaker is the most musical, one you never want to sell?

McIntosh XRT 20's. Not sure about "most" musical, but they were a wedding gift from my wife 38 years ago. Definitely both keepers.

Audio Physic Virgo II. Going on their 20th year, still play like new. I keep upgrading amp and pre-amp, but speakers stay. Using Eversolo A10 into Ayre 5ex. The original Stereoohile reviewer said “Where’d they go?”  Such is their soundstage. 

@jameslcroak 

I heard those Virgos many years ago. Amazingly deep Soundstage

Coming from a pair of the original Ohm F speakers in the 70’s and then a pair of Martin Logan Sequels with a few more in between I am now very happy with my Focal Sopra 2’s. Matched with a McIntosh MC462, Backert Labs Rhythm 1.3, LUMIN U1, Aqua Acoustics LaScala DAC. The sound is true to life. I must emphasize that I listen in a closed door dedicated media room.

My best all around speakers are the ones I have now. I bought a pair of Sonus Farber Amati G5’s.  I’ve owned more than  a dozen speakers from the really small ADS-300’s to some Maggie’s and some Acoustat X’s to the Dahlquist DQ-10’s modded with Decca ribbon tweeters and the Amati’s are almost perfect for me. Sometimes I wonder how they would sound if I replaced the tweeters with planer or electrostatic ones. Then I laugh at the absurdity doing it and move on, but…..