SET vs OTL


Could someone tell me the difference between a single-ended triode amp and an output transformerless amp?

Is it true that despite its operational inconveniences, a good OTL (eg Tenor Audio) will always sound more "natural" than a good SET (eg a Cary 300SE)?

Thanks
aarif
P.P.S

The French company might have been Jadis or Audioaero, both of which build good amps.
BTW, both on OTLs and on SETs low capacitance speaker cables are clearly preferable, think Shindo or similar
Do you guys that run low powered set amps prefer tube rectification or solid state diodes?
Thanks it was Audioaero. This was a good P.P. amp. that was flexible on which power tubes were used. I think I ended up using some old stock  6550s. This amp used 6SN7s as drivers and I was smitten by the Tung-Sol round plates in this application. Using P.P or S.S. designs sure makes life easier in many ways. 

Oh and so you know, much of the auditioning of amps was done on a pair of DeVore 0/96s which responded very well to changes in amplification. A speaker which is better than the sum of its parts and I mean this in a very positive way, although this was not my personal speaker.