Hello All,
From the list my personal favorites are,
"Nothing you could do"
At first glance there are quite some flaws to it, kerning isn't all that great for instance and the word spacing needs some toiling. But I like the dynamics of it, the weight goes well with the weight of the INKSCAPE font and logo and the sheer clumsiness of it appeals to the text "Draw Freely" as it expresses the idea of having no strings attached. It is a fairly unkempt handwriting style rough and raw like I could have written myself as a scribbled note. To my idea that is an important message to convey and none of the others make up to that as they are too tidy and constructed. There are some similar fonts that however don't have dynamics compatible with the logo and this one does.
"Seaweed Script"
A well constructed script, good kerning and as such giving a more professional aura. The weight again is compatible with the current INKSCAPE text and the weight of the logo. The dynamics are also compatible with the composition of the logo, but it lacks the concept of Draw Freely to me, for the fact of being so constructed and slick.
In general most of these fonts have rather poor kerning and that is the main difference with many of the proprietary fonts and why people still pay for them. Typography is an art that not that many master and the sometimes years of toiling that goes into getting a font done right isn't often valued. Using proprietary fonts as such isn't quite such an issue to me for that reason, same as using copyrighted images would be. The users of Inkscape do intend to make a living of their creativity as well and are not just creating content under CC license are they? That said however, using proprietary fonts might lead to IP issues and as such using an Open font might be a good idea. My two cents.
Cheers,
Jelle