UN Sonata, for me, and I have some...
A JLC Amvox I
A JLC POlaris Vintage...
And this UN Sonata...
The Sonata is the best choice, IMHO, as its alarm is very specific, it sounds a bit like a Minute repeater , while the others sound like an old school ring, or like a frog...
The Sonata is way more melodious, and...elegant.
But not the louder, of course...
Best.
Nicolas