set vs otl, which is the most musical

I agree with Acresverde. (I started to explain but determined that I can't say it better than Acres.)

I've owned only one pair of SETs, Antique Sound Lab Explorer 805s, that drove 86dB-(in)sensitive Quad 989s. As I don't listen at high levels, they and I matched very well until I tired of the 989s' treble balance and changed speakers.

But with a single output trode per channel, power output of an SET is always an issue unless one has very sensitive speakers. Mine are the opposite (at 84dB sensitivity), so I've opted for all trodes but lots of them, in the form of ASL Hurricanes in triode.

If I win the lottery, I'll buy a pair of 140-Watt Atma-Sphere MA-1s and keep one pair or the other. I love my ASL 'Canes, but maybe those OTLs will sound a little quicker, cleaner, bigger, etc.
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Nice as SET's are, they are always a bit different, specially in the high frequency Area... I own OTL's from Atma-Sphere, and in my opinion, that's the Real Thing (or very close to it). They combine the best from all worlds, Body, a High Frequency Range to die for and a holographic speed which has to be heard to believe.
But, you need a matching speaker to get the best out of it ( 8 ohms+).

>>generalizations are usually wrong, most of the time<<

Maybe and that's for certain.

I have owned both SETs and OTLs and, for me, the realism and speed of the OTL (Atmasphere MA 2.2) reigns. Never heard better.