Magico A3 vs. Wilson SabrinaX

Whatever sounds best to your ears should guide your decision. With that said, I do not believe the XA25 is enough amp to sufficiently drive either. If that is the amp you demo'd with the SabrinaX, then that might explain some of your impressions. YMMV

It was a a big Boulder class A power amp - Juice was there for sure! I @ironlung, I hear what you;re saying - I just can't find a place to listen to the Magico in the DC area...There are some encouraging prices for the SabrinaX (and Sabrina), and perhaps I shold try to  listen to them again. I'll try also the Totem Tribe 2 as well this coming week, and perhaps the Klipsch Forte 4 (or Cwl).This is a vast spectrum, and I forgot how difficult it is to get used to "other" speakers that the ones you've had for too long...

The Sabrina are the hardest wilson to drive. It would be worth checking out the impedance curve on stereophile. 
The Sabrina is pretty dynamic for a small speaker but they are a small speaker. They have a bit of a bass spike to my ears which I think makes them seem larger than they are. Sounds like you might want a bigger speaker. 
I have also heard the Cornwall iv and fortes  and they have a very different sound from wilson but you should give them a try. Good in a different way and much cheaper. 
I have not heard the Magico but I bet they are much more buttoned down than the wilsons based on the small sealed cabinet. 
I would add in the revel 328be in the same price range (or 228be at much less money). They are easier to drive and seemed to play with limitless volume. The tweeter is perfect, the mids are open and three 8” woofers push out the bass. 

Having heard both speakers, IMO the Wilsons are far more musical sounding than the Magico's. The new Sabrina X's are a major upgrade over the old Sabrina's...you sure you heard the new version and not the old version, which does sound more like what you describe.

I have owned a pair of the Magico A3s for a few years now. What initially drew me to them is that they are highly resolving and very dynamic. With tube integrateds they produce a wide soundstage with depth and great imaging. They are rated at 88dB and 4 Ohms. I have driven them well with all sorts of amps: First Watt SIT-3, M2, and F5. Those are class A amps and drive them well with zero issues. I also have a pair of Benchmark AHB2s. Again they drive them well and are highly resolving and quiet. With tubes which is my new revelation they dynamics are great and soundstage is wide. At times I hear things off to the side of my listening position. It’s incredible. Like anything, a system is as good as your weakest link. So if you have good well matched components, cabling and power management the A3s in my experience should perform well. I have not heard any Wilson speakers, though I am curious to do so. I will also say that the A3s are built like tanks. Magico dealers if they are like my dealer will provide good service. I am very pleased.