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

I love my Wilson Maxx II’s driven by 2 Krell EV600’s

Maggies for the past 50 years. The Tympsni 1D’s, 1.7i, and now the 2.7x. I’ve listened to many box speakers, but ageee with Tom8999 - once you listen to big planars you’re spoiled. Can’t beat the soundstage and no listener fatigue I felt after 30 minutes with box speakers. 
 

I drive my 2.7x with a Lyngdorf TDAI-3400 class D. I’ve had Class A/B (Audio Research SP-4a /D-100) was the best. But the Lyngdorf is superb! Weighs less than 20lbs, and 400w p/c into 4 ohms. Ethereal sound! 

My favorite would have to be the ADS L1590 floor standing speakers. They do everything well and go low in the bass. I still own a pair and use them daily, A good pair of original SNELL speakers , prefer the A model if I could get would match my desire for the slam and wonderful sound a good floor stander can provide!

I still have my Merlin TSM's. Should sell them, but haven't.

For tube systems, the criteria begins with high speaker sensitivity.  I have auditioned many brands and models and owned a number of models.  I have two pair that will remain... at very different budgets:

Daedalus Muse speakers (95.5 dB SPL). Meticulous wood finish and wonderful sound in their price range (<$10K).  They hold their own and surpass any models I've ever heard in their price range. Lou, the artisan / designer is a highly-regarded veteran in the audio industry and is directly involved in the building of each pair.  I'll add that I know a number of well-known dealers / distributors who personally own his creations as their personal end-game choice. If your budget allows, his Apollo speakers take it up to another level.  But the Muse are gems.

Tobian 12 Signature Horn speakers (99 db SPL).  Handmade in Switzerland. Works of art. Beautifully musical, meticulously custom-built. Priced at around $45k (maybe a little more due to tariffs), I haven't heard anything that outshines them at twice the price. I am using a pair of 300B tube mono blocks and a pair of 45 tube monos.  Imaging and detail are show stoppers. To inquire or buy, contact Mike at Suncoast Audio in Sarasota, the importer.