Or like both but prefer sugar (and fat carefully tempered to a delecate snap). But seriously if you don't like sugar I don't understand why you would be messing with chocolate anyway.
Incidentally try caramelising white chocolate. fucking great. Which I think supports the white choc ~= sugar hypothesis.
If you've never tried it, take a can of sweetened condensed milk and simmer it (don't boil!). It'll take several hours simmering, but when you open the can you'll end up with something very similar to dulce de leche inside.