It's quite a tricky situation really. We've got a lot of subtle variations on the same theme here, so I'm going to do another 'thinking-out-loud' idea.
CourageousLife's is, I think, the prettiest, but also the one which least fits the brief. Beyond that, the aesthetic differences give a bit of differentiation (Tallinn's issues of size-info compared to islander's street plan style), but for me the big issue comes down to one of explanation-
fundamentally, too many of these for me get a 'nice map, but why have you made those decisions' reaction. I physically cannot differentiate between Psephos's Oxford and Ares's Malmo because both are aesthetically very similar, and I don't know the greater area of either city well enough to understand why the choices have been made, thus without a description I can't work out why the network looks like that. The ones laid out on a map help mitigate this to some extent, but still leave the essential question of what makes *this* neighbourhood a better link than *that* one.
I thus find myself torn between Lock and Dr Noldescu. Both give detail for why the network looks like that, with a similar 'on plan' style. I think Noldescu has a better look and integration though. Point for the early frontrunner, though I don't think it's as guaranteed as I'd have assumed earlier.