LaScalla "horn" sound compared to "maggie" sound

I went from planars to horns back in 2006, sort of the reverse process--though it was Quads, not Maggies, and Avantgarde Duos, not Klipsch. So, I can't speak to the specific speakers you are talking about (though I played with Maggies many times back in the day), I can tell you about my experience in general. The horn speaker, for me, was more persnickety about everything upchain--and the SQ varied dramatically based on the rest of the system. Midrange was comparable to a good stat, but with a far more "in the room" quality and that so-called "jump" factor.  Same issues of bass lightness or discontinuity as stats when it came to mating woofers- of course, the original big K-horn solved that by corner loading. Size of image- Maggies present huge. It's fun, great for large scale music, my recollection was that they didn't have the pinpoint imaging that stats did- though more modern Maggies with ribbon tweeters and judicious set up may improve that. Horns- you don't even care about image, as such, because the of the "in the room" quality. --'Tis fun to have both. I just got my old Quad '57s restored. My horns are in storage awaiting a new room.